From raiders PoV:
The general tree looks pretty bad. Am not even sure I want Meteor or Shifting Power as Frost. Fire might want Shifting(but it's very weak), because 4% crit isn't that special and Radiant Spark + Meteor might do something for Arcane. But as Frost you probably only want Time Anomaly and then just pick up passives from the tree. Shimmer not leading to anywhere in the middle feels really weird, would be great if it lead to Flow of Time. Not to mention to take Shifting Power you are going to have to spend 4 points on really weak talents, which could be used on stronger ones. Time Anomaly being under Greater Invisibility also makes it a really strong defensive option compared to the other 2 especially for Frost which will need the extra defensive. Also RoP/IF being at the middle with nothing special leading to them is a bit weird as well, you will just always have Remove Curse and Spellsteal, might as well be base line the way they sit at in the tree and CoC/Shatter for Fire and Arcane is a bit weird.
Fire talents look ok. Mid part is a bit rough with routing(probs wont take PF at all), but the bottom has a lot of power baked into it. So if they balance it right. Fire will have a lot of possible variation. Only real gripe is that Blaster Master is back with it being 3 stacks and 3 seconds and not 2 stacks and 5 seconds like Infernal Cascade is.
Frost is weird. You either go pure ST with the current spec pretty much and gain nothing new, actually loose something even. For AoE you are giving a lot, maybe there is a middle ground that am not seeing atm. For M+ the AoE build will probs be just fine. And has the same problem as the general tree with having to pick Blizzard and Cold Snap to go through the middle that has by far the most power for ST builds. And you need to use 4 talents to make Flurry even work. I think the flow would improve here if they added routing from Brain Freeze to the left side choose talent in the middle and from Arctic Piercing to the right side choose talent. And Acrtic Piercing has a really short duration. Upping that to 10 seconds would be really nice.
Arcane though. Oh my. You basically have to choose between loosing out on either Arcane Harmony, Radiant Spark or Arcane Orb. Doesn't really feel good. And you kinda have to loose out on damage for you to pick Forsight, which frankly is probably an autopick for raiding. And still no Displacement and we need to sacrifice the defensive upside of Alter Time to do the same with clunkier mechanics.
Overall seems like the Fire tree is much more rounded than any of the other trees. Feels like they totally missed the mark with them focusing on each spec picking more of other spec utility and damage spells. There pretty much is only Meteor for damage and heavily nerfed Dragon's Breath and Greater Invis for utility.