The event will be a 10-player round robin. The list was announced on Chessdom on 9th February as:
World champion Magnus Carlsen (Norway, 2865), Fabiano Caruana (Italy, 2811), Veselin Topalov (Bulgaria, 2800), former world champion Viswanathan Anand (India, 2797), Anish Giri (Netherlands, 2797), Wesley So (USA, 2788), Vladimir Kramnik (Russia, 2783), Maxime Vachier-Lagrave (France, 2775), Shakhriyar Mamedyarov(2759) and Teimour Radjabov (2731).
Teimour Radjabov said it is a great pleasure to have tournaments like Shamkir and World Cup organized in Azerbaijan. He added that Gashimov Memorial will probably be the strongest tournament this year.
Magnus Carlsen was the winner of the first Vugar Gashimov Memorial tournament in April last year.
Personal Update: I was told that Wesley has confirmed his participation at the Gashimov Memorial and will not represent the US at the World Team.