Reflex - looks pretty, air control can be fun, looks fast
Reborn - looks like it will have something for everyone, 2GDs contacts might help the games popularity
Nex - weapons look super fun, will have proper matchmaking
Telos - tons of new interesting stuff, probably the most unique and different new game
Rekt - no idea but its an arena fps and its supposed to be in the later stages of development (unlike pretty much all the others)
Freefall - I like sliding in tribes, I think I will like it more in an arena fps
UT4 - should have lots of players, fun guns
Doom 4 - made by a big company, id are probably doing everything to not make the mistake they made with doom 3 so maybe that will be good for this game