I would think your chances would be pretty good. OKW and SSR seem to be the 2 resorts which usually have short notice availability. I booked OKW 1 BR 2 weeks ago for May 28 - June 4, 2010 with no difficulty, so I think at the 7 mo point you should be OK. If it is not available at that time you can always book what is available and wait list for what you want. Just make sure you book ASAP at the 7 mo point. Here's pixie dust to help you get your ressies!
Excellent. In all honesty, when I've called at the 7 month window, I've always gotten what I wanted. Granted, I haven't tried for something like AKV concierge, but have gotten BWV standard, BCV during Easter week, etc. OKW and SSR are two of the larger resorts, which makes your chances even better.