Mistweaver Monks right now seem balanced - I love the changes. At first I was worried about the nerfs, but with them actually fixing all the scaling bugs that existed with other abilities, we're in a very nice place right now.
Chi Burst seems to be the definite go-to ability for 25 man raid healing, depending on positioning ofcourse. The fact that it has a small cast time makes no difference as auto attacks persist during the cast. It also has no cooldown and a 2 Chi cost, which, for high AoE sessions, can be 'spammed', the 40 yard range makes this brilliant for not-so-stacked group healing, as long as a clear path can be seen and positioning can be found. Another thing to note about Chi Burst is that Eminence seems to proc from each enemy target hit.
Imagine this possible scenario for Chi Burst: Yor'sahj Heroic 25 - Black (adds), Red (raid damage - stack at melee), Yellow (boss CDs reduced) combination. You, as a monk Healer could stand far enough back that you're near or at the back of the raid, but still in melee range so Chi generation is no problem with Jab. The adds spawn, and all stack in the raid too - this would be a prime time to 'spam' Chi Burst, enabling the burst to hit not only the raid, but also the enemies, proccing Eminence heals from each add hit and the boss. Situations like this Chi Burst, if kept in this state, could allow monks to dominate in situational AoE.
Zen Sphere also seems like a great ability that could easily be switched with Chi Burst on a regular basis between bosses, not only does the sphere heal the target (probably best used on Tanks) for a hefty amount per tick, but it also damages a nearby enemy, procing a nice Eminence heal. The explosion heals for roughly double the amount of the ticks, to everyone around that target and damaging targets too. Much like Chi Burst, this could be extremely beneficial for periods of high AoE damage, using Chi for nothing but Zen Sphere could mean Monks excel at 'burst' stacked raid healing in similar situations as Chi Burst.
Chi Wave seems alright, I assume it's directed more at 10 man raiding teams with the 5 jump limit. It seems to work similarly to the Priest ability, jumping from friendly to enemy targets. It has a 5 second CD and only jumps 20 yards max.
The Tier 2 talents really do seem to be the deciding factor in regards of how Mistweaver healing will work. This is all speculation though as there's been no raid testing since the changes so everything I've said could be all completely wrong and stupid.