Some folks do have some interesting notions concerning "the integrity of the franchise" but, as has already been pointed out, nothing seen or said in any previous episode or movie precludes the appearance of bumpy-headed Klingons in the upcoming movie. Or smooth-headed Klingons. Or a mixture of both, plus some never-before-seen pointy-headed Klingons.
Bring 'em all on. "It is a good day to put your opponent's eye out with that pointy, pointy head!"
I'm boycotting the new movie if there are no Klingon Coneheads!
It's all about the 80s metal hair for me. No 80s metal hair under those helmets, no ticket.