Talking to Polygon Microsoft's Phil Spencer confirmed that Rare are working on an Xbox One title based on one of their classic franchises.
"Fans of Rare and Rare IP I think will be pleased with what we're going to show at E3. We had a limited amount of time today and a lot of story to tell. But Rare remains an incredibly important part of our development capability.
That historic IP that they've built I think can play a real important role on Xbox One."
What could he be referring to - Banjo? Conker? Killer Instinct? Perfect Dark? Surely not Kinect Sports?