I've just read on the official forums that as part of their attempts to nerf mana regen, they're talking about increasing the time interval on "mp5" gear. Rather than mana every 5 seconds, they're considering making it mana every 6; with all gear and skill values being the same as they are now.
From what I could tell, this would also allow them to talent (such as Imp. BoW) to reduce the time increment on the regen, rather than increase the amount per tick. Of course, this would also make the 5-scond-rule into a 6-second-rule.
Thoughts?