It looks like characters, sets, and items from classic films will be appearing as power discs for toy box mode. And it was also stated that there will be figures for characters who won't have their own play sets. So there's a good chance that Mickey, Pinocchio, Simba, Tinker Bell, and other classic characters will be making playable appearances.
I'm a little disappointed by the lack of attention given to the oldies, but it's still pretty early. Give it time. If you don't see your favorite characters within a few years, then you may worry.
You also have to keep in mind that the target demographic for this game are kids. Lots of kids will probably have more interest in the new, fresh stuff that they've seen in theaters rather than in the old stuff. Heck, I'm surprised that there are actually children who know little to nothing about movies like Beauty and the Beast or Aladdin! But anyways, I'm sure once the new stuff is out of the way, the oldies will start to surface.
(I read somewhere that Ducktales has a chance of appearing. There's one!)