** UPDATED 4th JUNE **
US Armory stats for 1st June follow, in addition I have now posted a comparison chart for each bracket, however while the main chart goes to 2400+(*) I have capped the comparison chart at 2300+ as things get a bit silly above that due to the small sample size, e.g. gains of over 700% in 2v2 for rogues at 2400+.
As you can see in the comparison charts things are shaking up a bit, especially in 2v2 and 3v3 where the large gains made by Rogues (and the popularity of double melee) has had a substantial impact on warlocks who continue to fall, actually below the target levels in 3v3 and 5v5, and just inside the target zone in 2v2.
Mages have also seen substantial gains in 2v2 and 3v3 (as a result of buffs, the increase in rogues, more people playing healer+ Mage or all 3?), but these gains have had only a small impact on their lackluster performance in 2v2.
Hunters continue to do poorly in all 3 brackets, a trend which has me somewhat baffled, a druid+hunter combination is not to be laughed at. (are all the druids taken by the warriors/rogues?)
In more general terms, in 3v3 the class performance is relatively unchanged until you get 2100+ where rogues, mages and Shamans see a boost.
5v5 continues a general trend of rogue and mage gains, and a fall for warlocks. The changes are less pronounced than the other brackets however and this may be in part because fewer people are as bothered about 5v5.
Enough of my waffling, the charts are pasted below.
(* I have included 2400+ as the top-end because while the sample size is still small, there are between 120 (3v3) and 232 (2v2) people with a PR at or above this rating and I decided this warranted inclusion for now)