Been playing beta #2 for a little bit- never did get a code to access it from Amazon (lol), but the stress test beta from two weeks ago updated itself and let me start playing online on 3/26.
There's now five playable characters (Jade, Kabal, Scorpion, Baraka, and Skarlet) and one Kombat tower (just basic battles against those five) available in addition to standard versus online play. Still no training mode, which I really, really, REALLY need.

I just don't 'get' this game and practice mode would help immensely, but TBH none of these five are characters I think I'd use. I don't think I've played against anyone online who hasn't used Scorpion, either, lol. Had a series with matches against a guy who threw me repeatedly. I couldn't get out of the throws and was going all Low Tier
GodFraud over it.

I was trying to throw at the same time- to get out of throws, you just need to hit a direction and a punch (dunno if kick works too) to escape.

After that it was a simple matter of avoiding spear-spam, blocking teleport attacks, and punishing accordingly. I like the slower pace of things, but I don't like all the canned combos and general 'stiffness' that has been present in these games ever since they went 3D. Netherrealm games just do not play as smoothly as other fighting games do, IMO.
The online is fantastic, BTW. Seen some people saying that they think this might be the best online in a fighting game yet.