No you're right when they produced the MKX XL discs they just shipped them straight off to stores without testing and no patches and it all happened last week.You do know that teasers are still official if they are made by official developers(or anyone else with some sort of similar clearance) of the product and purposefully show right?
There is no "no inside test team version" available to the public because those versions of the game belong to the inside testers.
Don't be naive, they've had these games in the office for a month at least and they have used them internally for testing. Everything on youtube is old and not supposed to be available to the general public. The patch on Tuesday will the state the game is supposed to be in. Lets all trust Taco and his gut feeling!