I've heard that some people involved in the making of the next film aren't entirely sure what to do regarding the appearance of the Klingons, if they are in it, e.g. the head ridges issue, how some Klingons have them and some don't. These guys should really watch ENTERPRISE "Affliction/Divergence"; that explains the whole thing. If they have to specifically address the issue, they should go by what those episodes established.