Originally Posted by MrsKent26
It is different though. The Joker is Batman's main villain. Introducing him still keeps thoughts with Batman and his future interactions with his main villain. It doesn't change the sequel from what it was: A Batman sequel. Introducing Flash and Wondy changes this from a Bats/Supes movie to Justice League Begins and that's where peoples' thoughts will be.
No it's not. You are trying to make it a different thing. Teasing the next story is teasing the next story regardless if it's the new villain or the group of guys Superman teams up with. If Flash and WW show up at the end it doesn't change the movie.