A cursory search didn’t find anything concrete on this, just a tangenital one relating to respawning.
Why not have a real year calendar mode for Cataclysm? Everyone I know looked at “days per season” and immediately cranked it up to 92.
I can’t imagine it would be trivial or simple to code, but I think a real-life calendar mode, with a calendar beginning 1 January and rolling over again on 31 December, would be nice. It would also expose new extension possibilities; you could have holidays with morale effects (get pumped up around nationally-relevant holidays, get sad around Christmas, etc.)