A global trailer will debut tomorrow. Details of the plot are still unknown but for now what we can glean from today's trailer is there is an organization called the Syndicate, an anti-IMF, that Ethan Hunt sets out to bring down. He will be helped by Jeremy Renner, Simon Pegg and newcomer Rebecca Ferguson.
For those of you keeping score at home Paramount registered the title Rogue Nation in January before Disney announced their latest Star Wars title Rogue One. Disney has agreed to keep Rogue One out of any advertising throughout the Summer, as a compromise, and for the fact that it has not been cleared for use by the MPAA. That is apparently a thing.