From thejawa.com's Hasbro Q&A:
It almost sounds like they are saying we're not getting a vintage wave in 2008 because we're getting more Evolutions figures.1) Nick@TheJawa - The modern Vintage line has covered almost all of our favorite heroes & villains from the OT, almost to the point of exhaustion. Army builders have found a niche in this line as well. But with the choices beginning to dwindle from Kenner's original character lineup, how is Hasbro prepared to meet the challenge of keeping a very popular line like modern Vintage going? What did the responses to polls on this subject reveal at Celebration 4?
We don't have any concrete answers yet on the future of Vintage. The poll answers didn't reveal one strong direction or the other - nearly half of fans felt that Vintage should be opened up to the entire Saga (probably due to the main characters having already been done, as you suggest, and wanting to see only popular characters in vintage), and the other half indicated that they want us to stay true to the Kenner roots and cover only OTC figures. With the issue of the main OTC figures having been done, it does present a challenge going forward on how to make future waves of vintage compelling, but it's a challenge we'll be looking at. There is no set date for when we'll see the next wave - right now, Evolutions is our premium-format focus for next year.