If you were looking forward to a lasting, multi-episode relationship with Sonic 4...consider this a Dear John letter. In an interview with DigitalSpy, producer and head of Sonic Team Takashi Iizuka says that we'll likely won't be seeing an Episode 3:
My sails are now windless. You can't give the people Tails and then take away all opportunity for Knuckles. It's just not fair. What say you Dtoiders, will you still be buying Episode 2?