Take a look at this week's Arena Commander update:
So, apparently the release date is set to May 29th. Hopefully, it will not be delayed again!
Anyway, any training ops planned for when everyone can play? I mean, my internet is crap, so maybe I'll have to wait until I get fiber internet, even after I do get access to the multiplayer stuff (I'll probably be stuck some time to playing single player, I'm pretty down the line).