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The people who work on Tekken aren't usually the same people who work on Soulcalibur. Different divisions of Namco.
While this is true, i would really assume that the next SC will even come later now due to Namco´s internal resources.
Not even 2012 maybe...
It's pretty debatable how much in the way of work and resources a game like this would take.
If we look at the example shown, SF vs Tekken, it's pretty obvious that it's just a straight port of SF4 at this point, with the exact same models and animations. Capcom would just have to make the Tekken characters, add in whatever new gameplay tweaks they need, and it'd be just about done.
Namco will probably do the same with Tekken vs SF. It'll be Tekken 6 with Street Fighter characters.
Usually the one of the most resource intensive aspects of developing a new game is the engine, because you need to have that done before you can build anything else into it. With both of these games the engine is already in place.