Outlander seems to have a ton of players ATM, although it's obviously hard to spot them.
Village went through a rough patch but has decent numbers now.
Empire was crazy strong with Bak pulling huge hours, but has stepped off with his and a few other key deletes.
Fortress I'm not too sure, seems to have numbers but has had only 1 leader for a while.
Tribunal seems busier than I've seen them for a long time.
Entropy was dead for a long time, but now has a few members. The IMMs on the main forums are talking about big changes coming soon too.
Scarab is quiet with only a few key players, but they never have big numbers.