The whole TGS trailer part occurs and the fake Dante lands on ground after that building jump.
The real Dante is below and this event occurs.
Dante: HAHA! Whoa! So That of all things is my clone. Looks like I'll have to shut your lab down permanenantly.
Then few more Dante Clones like this fake Dante close in on Dante for a fight. After battling them, Dante stabs the fake Dante in the face with his rebellion.
Dante: Sorry pal, this is my game.
Another cutscene occurs where 100s of clones like these close in on Dante and Dante butchers them all and stabs the last one from below and swipes his sword, the blood from his rebellion spills onto the screen in the shape of "DMC" and Mission 1 begins. --- I won't let u get away with this....
maybe the last mission would be a perfect clone --- it rained the day i was born but i was the lightning on that storm If you believe in Jesus Christ and are 100% proud of it, put this in your signature.
That would be EPIC! Not to mention that the way described Dante taunting, the "clones" actually sounds like something Dante would do. (unlike how this new thing doesn't act (or look) at all like Dante)