I guess you need to have seen “Be Kind Rewind” for this to make some sense. You need to have seen T2 for it to make more sense. You need to have seen both to really understand all of it. Choose to view accordingly.

This trailer looks amazing.  I was never much of a comic book geek, so I had to do a little googling to get the back story on this new batch of superheroes.  As usual, Wiki has all the info you need.