Ok, please understand this is simply from one person who mains monk, and has mained monk since 2.2; different people may have different opinions or ideas on the matter and I fully invite them to voice theirs as it will create a good discussion.
So from what I understand in 4.0 many classes are going to be looked at and reworked to ease the rotational complexity and consolidate a few of their abilities. However, I urge you, as Square Enix developers, please don't touch monk; at least not too much.
Monk is in a great spot as the rotation hasn't changed much at all since 2.x outside of the opener, and the extra abilities we've obtained are extraordinarily helpful and don't need much reconfiguration, if any. The only abilities I can think of that need any sort of adjustments are the other fists (earth and wind), One Ilm Punch, Featherfoot, and Haymaker. Also, a look into the meditation system would be nice.
Edited to add Haymaker and Meditation.