I remember being so insanely jazzed and proud that I got into the closed beta for SWTOR like VERY early. Wasn't so fun when the game launched and I was already burnt out on it. lol
To be fair, they didn't address a lot of the main criticisms from beta so the game predictably sunk into "Free to play" hell not too long after. Shame, it had a lot of potential.
Point is, I specifically did not sign up for this beta for the same reason as you. I think this one is worth waiting for.
I shrunk my Win10 partition from within Windows to make space to dual boot into linux so you definitely can shrink an active partition.