If anybody can get into the real depths of a fighting game system and bring out the details it's Desk. If you are interested in learning more about the system mechanics of Street Fighter X Tekken, he's put together something you will really want to check out. There are two videos, which you can view below, which show the concepts in action, even showing a picture-in-picture of his hands on the joystick so you can see how he does the inputs.
He goes even further by providing a nice post on his blog to give you even more information. He makes a point to say that the videos aren't meant to just show glitches it's meant to show you how the system works. It's great stuff as always so check it out.