LogFAQs > #962915807

Okay, for the basic skim until I parse just how different the jungle is, for heroes I've covered. Not too extensive, there are slight changes elsewhere.

Arc Warden - Double gets a damage penalty if it's too far away from the main body. Gets an extra point of agility every two levels. 25 talent changed to Double having 50% cooldown reduction.
Beastmaster - Slight damage nerf, 15 talent changed from personal movespeed to (slightly less) movespeed on BM-controlled units.
Broodmother - Spiderling base damage buff at levels 2/3, poison no longer deals added DoT and the slow scales based on level of Spawn. Shard ability can now be cast at any distance if touching a web. Talent reshuffle allowing more webs early.
Earth Spirit - Less strength per level, more base HP regen. Minimalist cast points outright removed for Boulder Smash/Rolling Boulder. Rolling Boulder damage rescale based on Strength, Roll max speed is now 1.6x instead of 2x if running over remnant. Cast point for Geomagnetic Grip and Magnetize worsened. Enchant Remnant cast range improved, significantly so on an ally.
Huskar - Gains magic resistance based on level of Berserker's Blood again (though not quite as nutty as it used to be, caps at 25% at level 4.)
Io - Tether heal-share improved at lower levels, worsened maxed. Overcharge slight nerfs to both cooldown and spell amp. Talent reshuffles power from Io itself to both Io and its tethered target (i.e. "+30 damage" is now "+15 damage to tethered units.")

KotL - Illuminate hits a wider radius, cast point removed, provides vision over a larger area. Knockback duration from Blinding Light doubled. Spirit Form cooldown slightly lowered.
Lifestealer - Rage cooldown increased at lower levels. Open Wounds will now spread to a nearby unit if a debuffed target takes 500 damage, preferably heroes. Open Wounds duration lowered.
Lion - Buffed _. Manacost for Finger slightly lowered. Cooldown for sceptered Finger also slightly lowered. Mana Drain now reveals invisible units.
Lone Druid - Bear base damage improved. Entangle on Bear reshuffled, deals its damage over time more frequently, but Entangle deals less damage at lower Summon levels. Spirit Link also shares 10-25% armor between Bear and Sylla.
Lycan - Feral Impulse damage nerfed by an additional 1% at all levels (so no more +69%, boo.) Shapeshift duration slightly lowered. Level 10 talent nerfs (less damage on wolves, HP regen talent for Feral Impulse now a Howl Damage Reduction improvement.)

Magnus - Scepter changed from boomeranging shockwave to exploding shockwave; shockwaves are longer range, wider, and explode after 1.5 seconds, causing an armor strip debuff/slow for five seconds. One talent change to improve Shockwave's damage instead of providing Magnus more health.
Meepo - Base stat improvements. Divided We Stand provides Meepo+clones added magic resistance (5/10/15%.) Manacost reductions for Dig, Earthbind, Fling. Clones don't get double benefit from Treads or Attribute Bonus levels any longer. Talent shuffle - poof damage moved from 15 to 10 (replaces base damage bonus.) Poof damage at 15 replaced by "Earthbind grants true strike" on targets which honestly sounds kinda huge.
Naga Siren - Rip Tide damage rebalance (more earlier levels, less later levels.) Rip Tide triggers on number of attacks rather than a chance. Level 10/20 talent tiers improve Rip Tide's damage/lessen amount of attacks.
Night Stalker - Crippling Fear cast point removed (instant silences!) Slight Dark Ascension talent nerfs, all other abilities gained talent buffs.
Omniknight - More base Intelligence and Intelligence growth. Degen Aura and Hammer of Purity swapped; Degen Aura range extended. Hammer of Purity no longer causes damage reduction, and is a castable spell rather than an autoattack buff, which slows the target rather than causing damage reduction. Heavenly Grace no longer gives status resistance (still dispels) and gives more Strength/Regeneration for each debuff dispelled.

Slark - Pounce deals a slight amount of damage on collision, search radius for this collision improved. Base strength slightly nerfed. Talent reshuffle to shift more power to Pounce earlier and more to Shadow Dance later.
Spectre - Desolate radius lowered and damage improved. Haunt manacost lowered. Slight level 20 talent nerfs (-50 health, -2% movespeed change on dagger.)
Techies - Is basically a whole new hero - more to be continued, but suffice to say he's not a passive trapper any longer, since he only has Proximity Mines.
Terrorblade - Less agility growth, better base attack time. Talent buffs all around, but Reflection still sucks.
Tinker - Continues to exist. Status resist from Defense Matrix lowered. Laser damage slightly lowered. Rearm duration slightly increased. March of the Machines removed, new shard ability Warp Grenade which damages a unit and teleports it away from tinker, lowering their attack and cast range. Keen Conveyance and Defense Matrix talents swapped from 15 and 20.

Troll Warlord - Now has phased movement under Battle Trance so you can get stuck in the treeline FASTER. Level 25 talent lets both Whirling Axes pierce spell immunity.
Tusk - Movespeed nerf. Walrus Kick cooldown nerf from 8 to 12 seconds, but this is cut in half if a creep is kicked. Walrus Kicked unit deals damage in an area where it lands. "Is both unit and vector targeted." Okay. Walrus Punch damage reduced at earlier levels, manacost an even 75 at all levels, but cooldown also heavily reduced at all levels. Ice Shards and Snowball damage both improved.
Underlord - Shard makes Firestorm waves fall quicker, not providing more of them. Ultimate changed from Dark Rift to Demonic Portal, which was its old scepter ability. Allies that go through the portal get damage reduction and movement speed. Underlord starts going through the portal immediately when he casts it. Scepter now causes a Pit of Malice at the other end of the portal, and enemies are slowed while they're in Pit's radius (apart from the usual "gets rooted once a second.")
Visage - Talents reshuffled to share utility between Visage and Familiars (i.e. "+25 damage" changes to "+8 damage to Visage and Familiars," and the 20 tier "+40 movespeed for Familiars" is now "+30 movespeed to Visage and Familiars." Level 25 Cloak upgrade taken behind the shed and shot (went from extra stacks to +10 armor a stack.)