My small guild was stuck at 81 for two months, and moved to 82 in one week after the changes were made...

So I'm pretty sure the changes were universally beneficial, or my small guild got oddly lucky. Considering this week most of them were in Mabar, I was carrying them the entire week too. So I don't see what happened (unless they added renown to Mabar kills, in which case awesome, and that would explain it).