http://www.arialasvegas.com/amenities/restaurants.aspx
Michael Mina, Julian Serrano of Picasso fame, Michelin 3-star chef Masayoshi Takayama, Jean-Georges Vongerichten, Sirio Maccioni, and others.
Looks like a pretty tasty lineup!
It will be interesting to see what the private-party-centric Takayama restaurant ends up looking like (and costing!).