The remastered version of DuckTales did not appear overnight. Capcom has been working with Disney on and off for more than the past two years to get the project off the ground.
Christian Svensson, corporate officer/senior vice-president at Capcom, likes to speak up from time to time on Capcom's message boards. Last time we heard from him, he revealed that all of the original DuckTales voice actors were returning to act in the game.
Recently, Svensson appeared on the message boards again, talking about how long Capcom and Disney has been working together on the project:
It took more than two years (on and off) to do the deal even before any development started. The first conversations I had with folks at Disney about this were had at Dice in 2010 (Feb 2010).
Initial proposals for greenlight started preparation in mid-late 2011 (when it looked like we would be able to reach a deal with Disney). Active development started a bit later after greenlight was achieved.
You can check out the game's original announcement and trailer here.