Little bits of new footage
of how the Time Travel works, Kitty's importance, and why Wolverine is actually the best man for the job.
sure, it might be Kitty that actually time travels in the story, but the movies are smart to make it Logan. Overused or not, he is the most well-known of all the characters, one of the main protagonists, and he was originally the one with the "outside perspective." Since much of the failure or success of the mission (I gather) will be the meeting of the two minds of Xavier and Lensherr, Wolvie's won perspective will be important.
Plus, as the clip suggests, hsi ability to heal will allow him to make the journey through time, so yes, Logan is the right choice all the way around!