The event will be a 10-player round robin. The list was announced on Chessdom on 9th February as:
World champion Magnus Carlsen (Norway, 2863), Fabiano Caruana (Italy, 2802), former world champion Viswanathan Anand (India, 2791), Anish Giri (Netherlands, 2790), Wesley So (USA, 2788), Vladimir Kramnik (Russia, 2783), Maxime Vachier-Lagrave (France, 2762), Shakhriyar Mamedyarov (2754), Michael Adams (2746) and Rauf Mamedov (2651).
Update (1st March): Wesley So signed contract for Shamkir tournament (unofficial)
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.
Update (1st April): Teimour Radjabov withdraws due to health reasons, replaced by Michael Adams