Of the four, I'd like to be most interested in Rainbow Six but they've shown so little of it that I have to imagine the single player is a mess or something.
I'm kinda interesting in checking out BLOPS 3, which isn't something I've said about CoD for a long time (MW3 was the last one I put any time into). And I'm kinda interested in Battlefront as well.
No interest in Halo, so that's a clear miss for me.