Some of the players I know, who use to play a lot, have said they are waiting on new content. They basically check in on the game once or twice a month to see if anything new has been added yet. While I too would love a new faction to play with, I'd also like to see some bugs fixed and new maps. Two of the three maps favor one faction over others. Then there is the Ram, who always seem to be fighting an uphill battle.
The bugs for Kain and the extra 3 points of damage the GoE get on everything BUT mages for scourge of mages are some of the biggest bugs in my opinion. Next would be tweaking ap cost for underutilized units...
Developers let us help you. That is what beta testers are for... (if you are listening and still care)
Again if there was a way that some select testers could "adjust" units ap and test to find viable ranges I think that would be a great way to easily balance a lot of what you already have here. Also allow you to focus on content and bugs to help bring back old players and hopefully keep new ones.
Just my 2.5 cents.