Basically the opposite what you just mentioned

There is a substantial increase in the mana cost of jab, so much that even the mana regen of Muscle Memory (New Passive interacting with Tiger Palm and Blackout Kick for 5.2) is not enough. So fistweaving is most likely going to see a much smaller niche and possible only viable on damage gimmick fights, otherwise you should get used to being oom.
They have removed the chi cost for our T30 talents and thrown them on a cooldown so now instead of dumping chi into them to generate mana tea stacks we have to basically use either Uplift, BoK/TP (Which is pointless after eminence nerfs and it doesnt give mana back unless Jab is used before hand) or Enveloping Mists. Enveloping mists is neither a strong tank-saving HoT nor a long enough HoT to sustain it on a tank (Like lifebloom). So another one of our current queries is where are we going to dump our excess chi in low damage phases.
They also increased Soothing Mist's chi generation rate (by an unknown formula). People with PTR access are reporting around 3 chi per channel of 8 seconds, which is a step in the right direction I suppose.
If you didnt fistweave in 5.1 then there's not going to be a whole lot for you to get used to as currently mistweaving is the most efficient way to heal. It will probably be the T30 changes that pose you the most problem as it requires a whole new approach to using them.
Hope I covered everything and that it helped.
TL;DR
Jab eats mana. T30 talents are nerfed heavily. Soothing mist generates chi a bit faster.