Rare on twitter:
https://twitter.com/rareltd/status/543442468562546690
I think, what this means is just that Rare has two (or more?) teams working on individual games, one that uses the UE-engine, one that uses the Rare-engine. I think these three projects shoudl in some way be done: Banjo (because it's the best IP they have, probably a bigger-budget game, using UE4?), Conker (revitalizing the IP with Spark, having Seavor as voice-actor, maybe a mid-budget game, using Rare-engine?), Battletoads (maybe mostly outsoruced, low-budget game for Xbox Live Arcade, using the Killer Instinct engine?)