BioWare - Mass Effect 3 and Project Wombat

Omega points out a piece at IGN about a tweet from BioWare's Christina Norman.  She teases about changes in Mass Effect 3 as she starts work on "Project Wombat":

Lead gameplay designer Christina Norman recently teased on her personal Twitter account she's starting working on something new for the third game. "Today I started work on 'Project Wombat' for Mass Effect 3," she wrote. By comparison "The ammo system in Mass Effect 2 was originally called 'Project Sasquatch,'" she added.

How about a third ammo system?