Capcom should be posting the list up within the next day, S.Kill says Fuerte "got nothing but better". In preparation, here's what we have thus far:
Alpha changes:
http://www.eventhubs.com/news/2011/aug/24/part-3-ssf4-arcade-edition-v2012-changes-dev-team/
Beta changes:
http://www.eventhubs.com/news/2011/sep/20/new-blog-details-more-changes-ssf4-ae-v2012/
http://www.eventhubs.com/news/2011/sep/21/part-2-beta-changes-ssf4-ae-v2012/
Loktest changes:
http://www.eventhubs.com/news/2011/sep/30/ssf4-ae-v2012-loketest-renewal-changes-dev-team/
The changes so far look pretty good overall, with a few oddities like Ryu's SRK change, EX Fireball from EX Flip for Akuma (wtf lol), and Cody and Gief getting buffed. Capcom also seems to have gotten a little overzealous with the nerfs to Yun and Yang, though Fei Long still looks pretty top tier.
The 2012 patch hits December 13th. Also, in case you don't own SSF4AE yet, Gamestop is selling the game for $20 (both PS3 and 360) until (I think) December 3rd.
Get hype!
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XS2 is the only good Xenosaga game - Lady Ashe