You didn't post this on the Font ID Board, but Beirut used Bryant 2 for the rebrand.
If anything, the idea that x.mas sounds remotely cool or new shows how old and out of touch some people at Pentagram really are. Either that or it's just a brilliant touch of sarcasm to go along with the idea that Christmas needs re-branding. Either way, I hope that they sell copies of the prospectus; from what I've seen online it looks great.
Captured from web.archive.org on 2 Nov 2012. view this capture