Summon Demonic Tyrant is now bugged cause its still not increasing duration of any demons, least on the PTR.
It seems like most of the previous problems with Arcane have been fixed with the new talents. Missiles is useful once again in the rotation, and Arcane Explosion, while still not affected by Charges, will make Barrage cast more often and improve the AoE rotation. I also find it amusing that I can equip the Soul leggo and randomly get fed +60% Arcane Powers.
All I care about is that mages finally have a Boralus portal!