I really hope that we don't get Charizard, Venusaur, and Blastoise reprinted. Even just Charizard would be a pain, we got them as ex's in FRLG, we got Blastiose in SW, and we already have tons of stuff that does something similar to Venusaur.
A friend of mine had a great idea for the three cards to reprint. Since we cant print any new Kadabra, why not reprint the Base Set Alakazam line? Its already been printed once, and can you imagine that card legal in todays format? It kind of gets around the problem with Kadabra, and they would be great cards to get back. I'm getting sick of the hype with Charizard, Blastiose, and Venusaur. Blastiose was good, but now its maximum damage is so low by todays standards. Venusaur would be ok to get back, but I don't think it's needed. Charizard, I am so sick of the whole, "Oh my gosh, it's a Charizard card!!! I have to get it!!! It will be so amazing in my deck!!!" It might as well be a rule to PUI by now, "Whenever we print a new Charizard, we make it horrible, but almost impossible to get."
As for the cards that we know are in the set, I know some of the Lv.X's like Raichu and Dusknoir. Other than that we can only hope for some good lines that don't totally break the format like Gardevoir and Gallade did.