I did some testing last night on my disciple and found a few bugs. Some of these are disciple specific, some not.
1. The reactions bar is bugged. I'm guessing this is due to the change to counterattacks being available for the full duration, regardless of what other spells are used during that time. But what I was seeing is that one of my crit chain attacks (Grasp of Discord I think) was popping up on the counterattack side of the bar (in addition to being on the crit chain side). At one point I had as many as 3 extra Grasp of Discord buttons, one was an extra button on the end and the other 2 covered up my dodge reactions of Kiss of the Slug and Sun Fist, making both of the abilities unusable via the reaction bar.
2. Stance buff icons. When first logging in, I was put into Tiger stance and the buff icon was displayed on the buff bar. Upon switching to Dragon stance, the dragon stance buff icon appeared, but the Tiger stance icon did not disappear. Upon switching back to Tiger, the dragon icon was replaced by a Tiger icon, but the original Tiger icon remained.
3. Changing stances. This isn't really a bug I guess, but more of a request. It would be nice if there was an animation to go along with switching to each stance. I would really love it if our combat animations were different based on stance, but I don't want to be greedy
4. Weapon dps bugged. I don't think all weapons were affected, but apparently it is something that a lot of people on test were seeing. Both of my handwraps showed 0-0 damage and 0 dps. I'd imagine that this is a known issue, but I'm posting it here just in case it isn't.