I update when I can, but I also have Christmas events to attend and take part in, just like a lot of people. I know I won't be updating Christmas Eve; Christmas Day actually seems a tiny bit more likely than Christmas Eve, but not if I get something cool to play with. I guess most of you guys who are not Canadian might not understand or "celebrate"
Boxing Day (Dec. 26), and I don't usually participate in the early morning line-ups in the cold for some shopping deals, but we'll see what's in the flyers this week.
The past few weeks' updates have been small because there have been fewer submissions, so I'm guessing the regular mappers have other things to do this month too, which comes as no surprise.
Maybe in January/February, after we've played the crap out of our new toys and games and there's not much else to do in the winter but play games (but not brand new games 'cause everyone's saving for a 3DS), then the contributions (and hence the updates) will pick up again.