#4 - Oct. 14, 2010, 8:17 p.m.
Heh, well 4.0.1 was essentially a complete overhaul of all classes, introduction of new resource mechanics, changes to glyphs, removal or conversion of many stats, those stat changes translating to enchants, gems, and items. It's a huge amount of work for class balance. If it were perfect out of the gate that would be worrying, as certainly some foul magics must be at work.
Regarding chat channels, they weren't a launch feature but are indeed coming, and the tech will be there and waiting for Diablo III, I'm sure.