A double-round robin with Kramnik, Anand, Caruana, and Gelfand.
First two rounds are complete, official website
here.
(Last year, this event was the Kramnik-Aronian match.)
Kramnik is kramniking the openings--not sure whether that's a full-time gig for him now, or just trying to be coy in advance of the candidates (where he and Gelfand will be be participating as well).