I have my ticket. I will be watching this movie. I don't how I will feel about this movie until I have seen it. However, from what I have read, I feel that the alternate reality universe is not equaling or exceeding the prime reality universe in the story department.
And, if it is Khan, why bother? He isn't Superman. He is a genetically enhanced human who was defeated by other humans. He is a relic from another century - this was proven in TWoK during the space battle. How will he or his followers be a threat to the Klingons? I see them being steamrolled by the Klingons in a battle.
Don't forget, though, that on Enterprise the Augments held their own against the Klingons in combat. And, considering that Khan has probably received training from Section 31, he'll be all the more lethal.