Sonic the Hedgehog 4
From Sonic Retro
Project Needlemouse is the code-name for an upcoming Sonic game, scheduled for release at some point in 2010. Announced on the GameSpot website on 9th September 2009, Project Needlemouse was described by Sega's associate brand manager, Ken Balough, as a HD graphics game, created as a response to "old-school Sonic fans [who] have long asked to see Sonic return to a more 2D style of gameplay."
A full transcript of the interview is available here.