This year, though, they've got the Olympics. They're starting the season early, right after the Olympics, and they're gonna advertise the hell out of a selection of shows, new and old, during those, so that they begin shortly after the Olympics end. I know Grimm and Go On (the new Matthew Perry sitcom) are getting that treatment, and I'm sure there will be others. I wouldn't be surprised to see them hold 30 Rock and The Office (if they give it a short order, which they should but won't) to the spring, to give the new sitcoms a chance to shine, and give Community and Parks enough time to see if they deserve a Spring. And depending on their success, they'll either advertise the hell out of some new shows in the spring (I get the feeling Community won't make it past 2013 regardless of whether it gets a back 9), or Parks and 30 Rock's finale.
My guesses: They'll keep the Wednesday block, Whitney gets a surprise reprieve in favor of Up All Night, and Whitney and Guys with Kids kick off Wednesday nights in August, and Thursday nights in August have Go On, Community, Parks, and something else new, potentially Animal Kingdom (or, disappointingly, The Office). In the spring, unless Whitney and Guys really, really hit it off, they put 30 Rock and The Office in that spot to get rid of them, and run some combination of Parks, Community, Go On (if they earn a back 9), New Normal/1600 Penn (which will almost certainly be paired together), Animal Kingdom (if it doesn't make it into the fall), or Save Me. They'll probably burn off whatever pilots they don't use in the spring, ala Perfect Couples, The Paul Reiser Show, Bent, and Best Friends Forever.