Believe me, one of the reasons why the f35 won over the f32 was because of the specific turbofan and lift system it uses. The sole reason for this laser is for that fighter. Nothing ever surprises on the things we can do nowadays, and the stuff they do tell us is just the tip of the iceburg.
I think the F35 with the laser will probably be a different variant, since it will not have VTOL capabilities, so Im sure more then just the marines will get them. Actually, I sorta doubt the marines will, the Air Force will claim the #1 priority im sure.