The 451’s first facelift (interior revamp, more airbags, deletion of the gray exterior valences, new colours, better warranty for US smarts) debuted in its third year of global production (2010) with the changes appearing in fourth year model years (2011).
The 451’s second facelift (changes to body panel design) appeared in the sixth year of 2013 and was the 451’s final facelift.
So this is right on schedule. The 453 is on to its third year in the world. A similar timescale was used for the 450’s facelifts.
I’m expecting the facelift to bring the 453 closer to the fourjoy concept. They’ll likely ditch the reflector headlight housings for full LED or at least projectors, and they probably reshaped the bumpers a bit to make it blend in with MB products better. They also likely got rid of the gray rear bumper that 453s somehow got saddled with.
ETA: Plus yeah, ditto Niteshooter...they aren’t going to camo something that’s just getting a new colour.