This event took me by surprise, so I came to the chess forum to check what BJJ had posted about the GP contenders. Shockingly, nothing!
Tomashevsky is the early leader, the only player on +1 after 2 rounds, beating Jobava with Black. He's also the player with the most to play for - he's currently leading the GP and his closest rivals, Nakamura and Caruana, are expecting to qualify for the Candidates on rating anyway.
Official site