For me, I find micro-transactions break immersion and pull me out of the game, so if they are included, I would really like to see a subscription model rolled out alongside, so that people like me can continue to enjoy the game, and the bells and whistles can be added without altering game-play.
Further to that perhaps adopting something akin to the Kingdom of Loathing donation/subscription model would make the player base content,
As for the game itself, I love the idea of new content, within reason, but new arcs, new stories, I like the idea of new ATs but I don't really need them, I think the present variety gives us enough,
However as was earlier said I would love if the build changing allowed you to change AT instead of just power picks/slotting, so one toon could have a tank build, MM and a blaster, and so on,
If it were possible, having a nemesis system, maybe a generic arc with your nemesis stuck in as AV, the arc being origin, AT and choice dependent, could be fun,
Or a nemesis group, to replace the somewhat generic gang, one group that would pop up as you progressed, targeting you specifically, there could be ambushes and what have you, and they could be showing up in the more common style missions; for example: click the glowie, defeat all, then rescuse someone's dog type of things,
As for transparency, NCSoft and all that, I want the game to be online and available, I don't need much more, so whatever makes that work, I should be happy with