When the June expansion drops, they'll likely give away omega for free like they have for the last few expansions. And I wouldn't be surprised if it is at the same time as the June vanguard playtest. So you'll be able to get in for free then, assuming it all works out like I expect it to. New map is coming in June as well, though it looks like it might be using the same tileset unfortunately.
I think the more they develop Vanguard the more it will be like the Dust 514 we were promised and more. Hopefully we will be able to deploy various NPC's to attack or defend command centers or some Upwell structures.