There are 3 attacks buttons 1 2 3, and a special button that does something different for every character. The attacks are just random attacks and work similar to MK, strings where you dial in.
There are several universal attacks, SF style universal not MK style. D1 is a poke, D2 is a Launcher, D3 is a sweep. B3 is a wall bounce, F3 is a ground bounce. Both F3 and B3 are pretty slow for everyone.
The combo system is very similar to MK, everything is juggle based, so gravity is what controls everything.
4 bars of meter.
1 bar is to meter burn which is the EX attack, there similar to brave edges from soul calibur, some moves get an extra attack, some better properties, and some have there animation canceled similar to a roman cancel.
2 bars allows you to do a pop up cancel or wall bounce cancel, you can cancel any string into one. I assume they added this to make it easier to hit confirm into your BnB's
4 bars is the super.
To stage transition you have to use the F3 wall bounce near the end of a stage, you can also do it with a wall bounce cancel.
You can interact with the stage with a button, most are useless, some can be comboed into.
The stages are very big, ridiculously big, because of this characters have great jump arcs and dashes, you can really move across the screen.
Directional blocking cross ups all that w/e.
There is a greater focus on air control then MK, basically everyone has a very easy AA move, and multiple moves that can be used in the air, either movement type specials, or IA fireballs.
Characters seem better designed overall then most MK characters, have more diverse tools, and more special moves.
The clash system, if you use 2 bars you can initiate it. When you do you can wager the rest of your bar, the defender is at a disadvantage because he can only spend 2 bars, the attacker can spend 3. If the attack wins, he does extra damage, if the defender wins he is healed small amount. This is all subject to change though.
Throwing is similar to MK, two buttons, throw breaks are not in any current builds yet.
Inputs are similar to MK, tap inputs, everything still has a dialed feel.
Everyone has unique air and ground normals, and different jump arcs, so the standard leapfrog jumping nonsense of MK is probably gone.
Probably some more that I forgot.
Yes it does suck that NRS never ever talks about there games in any fashion, and completely refuses to show footage of any kind ever.