He scratched a table and growled while saying "no comment." For real.
The official word on Castle of Illusion hitting Virtual Console and a new Ducktales game is, as of this moment, "no comment," according to Epic Mickey 2 Director Warren Spector at a roundtable during New York Comic Con. He followed his rehearsed "no comment" with a polite growl and brief scratch of the table in front of him.
At this point, the idea of a Ducktales video game appears to be Spector's dream game (following Epic Mickey, of course), being a fan of Scrooge McDuck. Scrooge appears in the 3DS Epic Mickey game. Spector's studio Junction Point is now owned by Disney, and while their next project is probably at least a year away from being announced, they are currently developing something as their follow-up title to Epic Mickey 2.
Castle of Illusion, which is the Sega Genesis game that is spiritual predecessor to Epic Mickey: Power of Illusion, has been previously rumored to be a Virtual Console release. We do know that Disney and Sega are speaking about the game, as music from Castle of Illusion is being used in Power of Illusion. Only time will tell on the possibility of a re-release of the game.
At this point, we know the people making these Epic Mickey games really want to bring Castle of Illusion and Ducktales back in some form, but it's not entirely in their hands, as Sega and Disney need to work out a deal for Castle of Illusion, and Disney gaming executives need to think a new Ducktales game is a viable product.