In the past, when Blizzard has done the class reviews, the members of that class have all talent points refunded. It's like they never spent a single talent point. All spells that you have because of talents are also gone. Since this is affecting ALL classes, every character is getting their talent points refunded.
Oh, joy. Another evening spent fighting the downloader and then respending 7 toons worth of talent points. And then retraining them all. :P
This'll be fun. Glad I don't have anything ELSE planned for tomorrow night.