There is no difference with spellcasting, what I have noticed. The difference is how NPC uses WP.I have the upated pdf but i can't spot any differences with the physical one... I'm sure that the pdf is updated because of goblin/nocturnal!In the Player's Handbook 2nd printing (on Kickstarter now along with the new campaign book, Bitter Reach). If you have a PDF of that (from DriveThruRPG most likely) then that should be updated by now). Tomas said on KS that they might make an errata PDF for everyone that doesn't have PDF of the books (and thus haven't got the updated book), so hopefully that will happen.
Where are the new rules for spell casting?