The Squad does look interesting but we'll see, Arma 3 has been out a while now, it's had a lot of post-release development and the mods for it get better and better all the time.
I've really enjoyed the Arma3 DayZ type mods, with all the maps from Arma 2 like Taviana and Lingor...but the actual military mods (king of the hill etc) are really excellent too.
So I think I'll wait a while on this, if I've learned anything lately, it's that Early Access means that a finished playable game is in the region of 3 years away, at the very least...