As of post, it seems like things are relatively close to each other. The most voted for has been level cap, content (both which may go hand-in-hand), and elimination of spammers and botters. Next is character patch (bleh, Priests), followed by female Gunner (I'm surprised), last with cash shop update.
Cash for items trade could go with cash shop update?
I'm honestly placing bets on content update in FEBRUARY. It's just a feeling, I honestly don't think they'll do anything productive this month, and I feel like things will start weighing on Nexon again too much to go past March without updates.