When healing M+ on beta, I messed around with quite a few builds. Temporal Anomoly, while it can REALLY provide you a lot of healing (the absorb + the free echo’s) will drain your mana super fast. If you have a stacked group, Emerald Blossom can be excellent for grouped healing. Personally, I find the Green tree to be great. But I have a build that doesn’t follow at all what WoWhead would recommend and it’s allowed me to fairly easily manage 15s on beta without any major issues. The hardest part is dealing with all ranged groups that stay entirely spread out (Especially during bursting).
Things to note: Your Fire Breath, if you’re spec’d into Life-Giver’s can be a massive burst heal (on someone; I’ve been complaining for months its hard to tell who it will actually heal) but the DoT from Fire breath, especially on large packs, does a TON of healing. I usually only casting rank 1-2. I don’t ever fully empower it.
It’s important to learn when to fully empower and when not to your abilities. For example, if you need a large single target heal on 2 people only do a rank 2 Spirit Bloom.
The higher the empower level of Dream Breath, the more healing it does initially and the less over time it does. The lower the level the less it heals up front, and the more it heals over time. Rank 1 dream breaths can be like blanketing your group in a nice large HoT. Once again, all boils down to timing the empowers and deciding what you need in the moment.
Call of Ysera can make a very, very large dream breath.
Echo, especially if you’re talented into Oroborous and Time Lord can be very strong.
TIP: If you put Echo on someone, cast living flame and immediately cast Reversion, the reversion will proc echo before living flame (travel time apparently). It will also do that with emerald blossom too. If it pops before your living flame hits, that’s the healing that gets duplicated. So be mindful of that so you don’t accidently waste a set up. EDIT: Also, to add to this, you can also time it so that you cast living flame and immediately spell queue an echo and it’ll still proc the second LF cause echo will hit before the travel time completes. 
Stasis, while an awesome idea, doesn’t feel good to me. Idk why. Maybe I just don’t like having ot set up my own “convoke.”
Cycle of Life can do massive healing, but requires you to us EB more often. Not a problem because EB can be great for Triage Healing on multiple people while you’re zipping around and doing damage.
Echo will duplicate the HOT from Dream Breath (so you can have two of htem on one target if aimed correctly).
Use Reversion right AFTER someone takes a massive hit if you’re spec’d into Golden Hour. Golden Hour can do a TON of healing (I’ve seen it crit for close to 100k on beta).
Another pro tip: If you haven’t figured it out yet, Verdant Embrace DOES NOT protect you from damage while you’re flying. So if you go flying through stuff to your target, you’ll likely die.
Rewind can be a powerful CD, if used immediately after everyone takes massive damage. If you wait too long, it does less healing.
