We'll probably end up with a film where everyone is chasing an Iconian artifact of incredible power. First it'll get picked up by Harry Mudd, who gets captured by the Klingons then the Romulans will ambush the Klingons then Kirk will sneak aboard the lead Romulan ship (with Kirk in full Romulan makeup) to steal the artifact while Spock woo's the female Romulan commander. At the end, they'll dump the artifact into the sun.
Only they get too close to the sun and end up being slingshot forward in time (into the prime timeline as the Iconian artifact opened an interdimensional doorway) and team up with TNG who have to help them get back to the past/alternate timeline as the crew have all begun a rapid aging process due to the unstableness of the interdimentional time travel combined with the effects of the artefact. The climax would see the Enterprise E battling several Romulan warbirds and Klingon BOP as the damaged JJprise (with aged crew) limps toward an artificially created rift/anomaly to the alternate past..
nick frost as Mudd, rosamund pike as Romulan Cmdr, with TNG & TOS casts (with CG Kelly, Doohan)
I don't think CG is at the point where it can do realistic looking people (yet) we'd have to wait a number of years still....
It is getting better, sure, but it still has a long way to go to get out of the Uncanny Valley completely....