ANNNND so would i be, an analysis has been done:
http://www.hypercombo.net/2010/07/analyzing-the-street-fighter-x-tekken-gameplay-footage/
summary:
1. The game is most likely very early in development, and most features of the SF4 gameplay system, as well as the basic speed and feel of the game, currently remain intact. Even the SF character models are straight out of SF4.
2. Kazuya has a crouch dash which can be very quickly canceled into different moves, just like in Tekken.
3. Ryu has his Joudan kick from SF3. It causes wall bounce.
4. Certain Tekken hit strings seem to be manifested as special moves, while others are manifested as strings. The only follow-ups we know for sure are optional are crouch dash -> Hell Sweep/EWGF and Hell Sweep -> Hook.
5. Throw tech system and throw startup is the same as SF4.
6. The relationship between blockstun and hitstun is the same as SF4 (i.e. blockstun is significantly lower than hitstun).
7. SF4′s quick getup and untechable throw knockdowns are both in, as is something resembling the rolling cross chop getup from Tekken.
8. Backdashes are invincible, just like in SF4.
9. A new ‘stagger’ hitstun allows easy combo opportunities.
10. Ryu has his 3rd Strike target combo.
11. Some sort of team super attack is present, though it’s impossible to tell how it functions.