I actually like Fury of the Sunwell, it's great for when you lock down a single target with Lapsed Gravity, you can get off a nice double nuke. Fury of the Sunwell makes Flamestrike more useful for nuking waves with Mercs and damaging structures in general. Fury of the Sunwell might create a positive feedback loop between Lapsed Gravity and Flamestrike where Energy Roil or Convection and Gravity Throw are more appealing talents to choose in conjunction with Nether Wind and Fury of the Sunwell but that's doubtful. People will probably just look at the old Flamestrike cannon build, find it's not as useful and gravitate back towards Chain Bomb or just drop the hero outright. I think the change to Gathering Power's baseline damage bonus and how it scales is bigger than having Ignite replaced by Fury of the Sunwell. The changes to GP make it an even greedier pick than it already was. GP is still the same power spike it was but it's so much more risky to take. You could just be wasting your level 4 talent pick with GP some games. That already happens, but now it will be worse.
I like the increased cast range on Pyroblast, you can be a little safer with where you start to channel and it can be harder to get out of the cast range but Al'ar will probably still be the gimme pick most make.
The new map is completely ridiculous, it will be hilarious if what's on the PTR is what gets released to the public. Those Punishers are completely absurd. I gotta admit though, i like that better than BoE's glass cannon Immortals. Kael can farm the shrines so easily with Flamestrike alone. I need to try it out with Al'ar to see how much easier it is. Sylv will probably break that map as much as she does Haunted Mines.