Update 2: Enough speculated! The teasers were for this new contest series.
The picture below was posted on official forums by StevenI a short while ago:
Oooh, what could it be? Keep your eyes peeled for more hints.
Update: Before you get even more excited (is that even possible?) this is not coming from MediaMolecule directly. It has nothing to do with anything they may be working on. Keep in mind that these hints are posted by someone from the community like you and me.