I think the Quantumania trailer is a fake-out The last bit where Scott and Kang are fighting and having a dramatic final battle and Scott drops the "We just both have to lose line" feels like a finale like for movie. And it feels super weird for them to drop it into the trailer. However, what if thats conqueror variant fighting one of the Scott variants. We saw numerous Scott's in that trailer and even a pit of Scott's. So, what if that big final battle moment is at the start of the movie and we see Kang kill another Scott variant before he moves onto the next one, i.e. 616 Scott