I recall mudbunny's having been an active member, or organizer, of the community on the WotC boards. Maybe he left a notice of absence there. I'll do some more looking around. If it's a WotC group thing, they may be taking a long weekend including the 1st-2nd-3rd-4th of Jan. 2015.
If I find anything, I'll add it here.
Edit to add: After 20 minutes of searching: No such luck. Mudbunny seemingly has only 1 post on the new WotC forums.