They have already said the difficulty of 2.1 CT was perfect and that's exactly what they're targeting for 2.3.

I'm fine with that, but I really would like if in 2.3 when they add support 24-man premades they also added a "hard mode" of the first floor of Crystal Tower. Presumably they already have the work for this done, since the original CT (before they delayed it until after launch to make it a more appropriate difficulty for PUGs) was supposed to be much more difficult.