No way they would make SF6 exclusive.
I doubt it.
Capcom are not in financial trouble this time around, and it seems too soon to announce PS5 games anyway.
What is EVO? /tilting head inquisitively
It's the biggest fighting game tournament in the world, held once a year.
If you click on the tweet you can find info about EVO: http://evo.shoryuken.com/