There don't seem to be any absolute top players, but with nearly 200 GMs, 42 of whom are 2650 and above, this is going to be an incredibly strong tournament, and one you should keep an eye on if only to see what happens in your favorite openings. The tournament takes place from March 5-18 (but the playing days are from the 6th to (I think) the 17th) in Rijeka, Croatia. It's an 11 round Swiss, using the standard FIDE time control of game/90 + 30 second increments after each move.
The tournament website is here.