I don't go looking around at others' resumes, but Superannuation does, and they found that Crystal Dynamics' level artist Matt McCulloch is currently working on "wildly cool environments for a soon to be announced title for Crystal Dynamics" on his LinkedIn page.
We heard something about a new IP last year, but haven't heard anything since. Hmm.
But something is coming. Look at this listing for a senior artist position at Crystal Dynamics. It says that the applicant could be working on "a brand new AAA game being built in our Redwood City studio." As the job description continues, it again mentions work on a new IP.