I really do not want to see the Klingons as the focus in the next film. As background characters, fine. But the Klingons are the Trek race that has been most done to death.
Furthermore, I'd really like to see J.J. and company tackle something completely new and fresh, rather than riffing on an old villain or storyline. You can still have all the fun callbacks to TOS. Just don't make the main plot or antagonist something straight out of TOS.