Bolt had to go, it's stupid. It's a get out of jail free card. If it functioned more like Dota's Blink Dagger--you can't trigger it if you're being damaged, so it's more of an initiation than an escape tool--then Bolt would be fine. Instead it's a total shutdown of ults late-game. Leoric lands Entomb and to secure what could be a game winning gank and put the other team down a man? Nope, bolt out of trouble.
What worries me more is the loss of Flamethrower, KT loses late-game mobility, fine, but now can't build into nuking from a safe range. At least the new talents look interesting, they sound like they really up his risk/reward play. Master of Flames sounds kinda like launch Chain Bomb. Convection has been reworked from a lame damage bonus to enemies hit with Lapsed Gravity to an interesting take on Seasoned Marksman. Combine that with Burned Flesh and Sun King's Fury or Fury of the Sunwell and it looks like Flamestrike builds could be a thing. Even the new Lapsed Gravity talents sound interesting, dramatic CD's, increasing duration and making enemies vulnerable.
I don't get why they nerfed Sunfire Enchantment though, it's a barely picked talent as it is.
Also Li-Ming is going to get bodied with the nerf bat. She has to. But she's going to be a problem for a while longer.