The only real info about upcoming stuff (other than Poker Night exists, what the setting looks like, how it's incredibly goofy, and what characters are in it) is that Christopher Lloyd is doing voice acting for the Back to the Future video game, and they got permission to use Michael J. Fox's facial appearance. (Whether or not he'll do his own voice acting is yet to be known...)
It wasn't really an "announcement" panel, and most information came from questions during/after the panel. What basically happened is they took a bunch of characters from assorted games, basically shouted out scene ideas to the audience, which voted (by clapping and screaming) which characters to do assorted evil things to. Then a crazy script was formed out of our random shouting and they made a cutscene using Telltale's game engine.
So basically, it was a "goofing off" panel. (Don't take that the wrong way. It was tons of fun.

)
Other than that, there was a bunch of Sam and Max voice-acting outtakes that they'd animated for fun.