ZkinandBonez said:

According to the Meet Captain Phasma article by Vanity Fair yesterday it was Phasma chasing the Millenium Falcon in the trailer. So does that mean that this guy is actually Captain Phasma in a Tie pilot uniform?

http://www.vanityfair.com/magazine/2015/05/gwendoline-christie-star-wars

My guess is they've got that part wrong. Just because it's chrome doesn't mean it's the same guy. For all we know, all the Tie Pilots are chrome, just as they were all black in the OT.

More likely than not, Phasma would have a fancy tie too if she has one at all, like the one that kills all those troopers (it has a different rectangular window to the rest).

I just think it would be kind of silly for the already armoured character to go through a costume change just to get in a Tie.