I really hope this happens, and here's some stuff I think would be fun if Mel Brooks incorporates into the sequel.
First off he should make it a prequel. It'll still be "Scapeballs 2" but set it before the first movie, or call it "Chapter One" in the opening crawl or something as a homage to the Star Wars prequels, etc...
Because of the sad passing away of John Candy they should make Barf a fully CGI character, and incorporate that into the jokes of how technology has advanced. We could have Lone Star getting the eye lines wrong ad looking at Barf's chest and Barf can keep pointing to his face to correct Lone Star' eyeline. Or maybe delayed reactions from Lone Star after Barf whacks him with his tail, etc...
New characters including an annoying Jar Jar type character.
We should see Yogurt fight!!!
Dot Matrix could have been made by Dark Helmet as a sex toy or something ...
And I'm sure there's more Star Wars prequel takes he can make for this movie .
It's gonna ROCK!