Jyn Erzo's (Felicity Jones), Cassein Willix's (Diego Luna) and the Asian bounty-hunters' (?) outfits were on display at the Nürnberg Toy fair back in Jan/Feb.
There is a thread on the Replica-Props Forum
with some photos from then.
Back in August there was also a highly detailed still with these characters (and other Rebels) standing/sitting in a room.
From what I can see in the trailer, a couple of older outfits have changed somewhat:
X-wing pilots have flightsuits of redder orange fabric that is puffier. Looks like there could be a metal zipper at the bottom of the leg. Ejection straps are more ribbed and seems to be attached with belt loops on the legs of the flightsuits. Belts are beige (like in some exhibitions but never in the movies). Some buckle or greeblie on the gauntlet.
The Rebel officers wear a variation of the ESB/ Hoth uniform with quilted shoulders and red piping.
The pips on the rank badges are recessed: I can see from the side that it is a sandwich of metal-plastic-metal. I would guess that there are only holes in the top layer. The ANH/ESB rank badges were metal plates with round pips on top.