how many submissions are there?
the only ones ive seen/done are the gullitene, arm bar, leg bar, kimura, flying arm bar... are there any otherS?

Rear naked choke and that's all of them I think.

North/south choke. There are also variations of each submission depending on the grappling style of the fighter your using.

On the subject of submissions does anyone know how to do the knee bar where by your on your back (after being knocked down) and your opponent approaches you and you pull him down into a knee bar? Did it by accident once and Iv seen players swiping with there hands in that situation but I havnt been able to pull it off since.

hold L1 or LB and click R3 but i think u have to be BJJ but not sure

Yeh I figured it was only bjj fighters. Ill try that out man cheers