I know this isn't going to happen, but I think it would be a pretty cool idea to have a part of the next film involve Spock Prime attempting to communicate with the Prime Universe. Yes, I know this is far fetched, but it's just something that came into my mind. Spock always tries to find ways to restore the time line or at least attempt to find ways to get back where he came from. I'm kind of surprised why he didn't bother going back to 2387...Although I know the real-world reason why.
Hmm, nuSpock doing the "phone a friend" when he wanted information about Khan was nice (kind of?), but will probably the last time we will ever see Nimoy on screen.
Frankly, the time of the old cast is over and contacting the prime universe would just be stepping into the mess (i.e., CANON) the new franchise so strategically plotted to escape in the '09 film.