There has been some confusion regarding the changes to Arena Team and Personal rating calculations in patch 2.4.2 for those players with 100% participation on their team so we’d like to clarify how the system works now.
The adjustment to a team’s personal rating can vary based on the average personal rating of the other team [...]

Here is the last part of the whole Arena Season 4 guide. Once more with FEELING! Information about personal rating requirement, season 3 gear, season 2 gear, and how the arena changes are going to effect everything.
I really don’t understand why Blizzard is trying to turn the arenas in WoW into a freaking e-sport. [...]

Yes, the Season 3 honor items will still be available for purchase without a rating requirement after Season 4 starts.
There will be two sets of “non-set” items once Season 4 begins. The Season 4 honor items (boot/belt/bracer/etc) some of which will require a rating, and the Season 3 items (boot/belt/bracer/etc) which still won’t require [...]

GET READY TO HOLD YOUR COLOUR!
While Season 3 is still going strong, we wanted to announce ahead of time the rating requirements that will be present for arena items once Season 4 begins. We also wanted to give everyone a heads up to some changes that will be in an upcoming patch, altering [...]