This news comes from Quint over at Ain't It Cool News. It's something I've been waiting to hear for a few years now!
I'll flesh this out after the panel ends (still continuing) but I wanted to start with this, straight from Robert Zemeckis' mouth:He couldn't confirm or deny ROGER RABBIT 2... BUT he said if it DID happen that all the 2D toons would REMAIN 2D. That doesn't mean there wouldn't be 3-D animation (Pixar characters maybe?), but he wanted us to know that he's not upgrading the characters.