Not sure what this includes but I am currently installing an update named'HTC Update for Windows Phone'. This is with an O2 branded 8X, will update with change log (if given) here.
No change log and no visible changes as yet, it might be the update for beats that we've all been waiting for.
I think it was just a firmware, i'm on 1532.20.20003.206 post-update.
I might have got a Beats update but i can't remember...i do know that my audio is crackling half the time with a reboot required to fix. We shall see if this update has fixed it!