Also, what will be the standard control scheme for this game? Block button or hold back? I understand it had options for both?
Based on default layout in the demo, (and on my VSHG; 6 buttons, Madcatz layout)
1 2 5
3 4 6
1 is L
2 is M
3 is H
4 is T - trait button. It is like the Drive button in Blazblue where they do character exclusive moves
5 is stage interaction
6 is EX special/meter burn. You can pushblock with it for 1 meter
1+3 is throw
1+2 is stage interaction
2+3 is stance change
1+2+3 is EX special/meter burn
2+3+6 is super (strange, i know...)
b+3 is stage transition (if not near enough, it will wall bounce opponent instead)
Personally, I probably want something like this:
1 2 3
4 6 5
And yes, you hold back to block. I dunno whatever notation Injustice is going to standard but I've seen devs use notation very similar to Tekken's (non-Japanese).