If this had not already been brought up.
Create a mentoring system, I mean if one person expresses knowledge about one class and seems to know the insides and outs of said mechanics, make class specific MVP's and also in game option to ask "Class Masters" questions on specs and what not. Provide accessability in game and only allow a level past a certain level, send questions to filter out some questions. Also make said level coincide with the last respec if there is going to be limited respecs.
I for one would love to do this granted it would take alot of time out of playing diablo 3, BUT, would provide a better game in the end run.
The only reason I mention this is because it seems to be hard to get your questions answered. The hardcore people would of course probably not need this, but new people just starting out. People who might be good in video games but has a hard time finding information on the internet.