I didn't see a specific thread talking about the subject, so I hope that this hasn't already been discussed to death.
If the Klingons appear in the new film with ridges, how will that be explained? Klingons in the mid-23rd century should not have cranial ridges! Wouldn't depicting Klingons with a ridged forehead in the new film be a slap in the face to Trek canon and history?
Abrams could argue that most people who see the film won't care or have even heard of the augment virus, but some fans will care and for the integrity of the franchise, the Klingons should not have cranial ridges.