I would assume so since his assist seems to be the freeze beam, and for characters without a stun move that should be quite helpful.

Ya his freeze assist seems like it could be helpful in combos, won't really know until after the game is out.

I wouldn't give up on 1v1 Sub-zero yet, he's slow but does high damage. Besides, we can't really say too much on a pre-launch pre-tested build lol. If NRS lives up to their promise then he should be balanced either at launch or patch. I highly doubt the game will be balanced on launch though (in fact, I guarantee it won't).