I say Lagat can do it with the pressure from this high quality field. Also, according to some, if the conditions were better last week he would have had a good shot at BK's AR in the 5k, so clearly he is in great shape. He is more of a miler, so the 3k should be his sweet spot, and he should be able to better BK at 3k more easily than at 5k (say that 5 times fast).
I say 7:28.9.
How about Teg and Solinsky? Don't know what kind of shape they are in. But Sihine, Kichoge, and Shaheen (coming back from injury) should all be hot on Lagat's heels (not to mention Masai and Feleke, and the US guys).