The magic system isn't fully developed yet so we don't know if there will be any homebrew in final release.
Warlocks (or Sorcerers) learning cantrips from scrolls doesn't feel right. But with Wizards more flexibility would be ok.
Every class using scrolls freely doesn't feel right either. The Magic Initiate feat should let you use scrolls but not without an ability check if the spell is level 2+.
