Ill start off by saying that i dont like arena, i also know that many people like it. Also if you dont like this system please explain and tell your ideas.
From the point of view of Blizzard Arena made class design alot harder to balance, and sometimes alot of nerfs and buffs here and there just because of it. Alot of times when someone says PvP it means arenas, not battlegrounds (and BGs are the original version of pvp). Many changes in here are due to the fact that rated battlegrounds will be THE group pvp experience when arenas are more for individual skill. All arena statistics will be recorded so you mages can brag about your win ratio against warlocks in the secondary bracket as explained below.
So i would like to propose a change to arena system for Cataclysm, something along the lines of:
Arenas are too dangerous and expensive to run because of Cataclysm, so the goblins remade the rules of arenas
-No more teams. Each player fights for him/herself against another player in 1v1 only.
-In the main bracket you only fight against your own class. Rating still applies normally.
-In the secondary bracket you fight against other classes. Here im not sure if it would award more points or less points, maybe make it 10% of normal rating gains. Secondary bracket does not provide tier-3 arena gear. <-- all this may not be a good idea
-All cooldowns are now available. Ressurection will count as another point so if you ressurect and die again you lose twice as many points and the winner wins double too.
-At end of seasons the titles are calculated like now or similar.
-There can still be skirmish against other classes.
-There can still be skirmish in 2v2, 3v3 and 5v5. Special cooldowns disabled like now.
-You can queue as a raid for skirmish arenas, each party will be a separate team, the parties will fight eachother, its not queue against other randoms. Here it may vary, either team 1 and 2 are the ones fighting the rest are spectators, each of of 8 teams are randomly picked to fight eachother or all players in that raid are picked into random teams to fight eachother depending on what bracket you choose (2v2, 3v3 or 5v5)
Gear is divided into 3 tiers. All pvp gear is now 8-piece sets. The gloves bonuses is now rolled into a set bonus. The off-set items are not Unique, this includes two rings, two trinkets, neck, cloak and weapons.
-Tier1 is the generic type such as the craftable blue gear. Its the "blue" pvp set for new players and yes it includes weapons. The items are generic type but colored like the arena sets. Buyable through honor/badges or arena points.
-Tier2 is the low-end epic set. These are class/spec specific like they are now. Buyable through highest badges but require alot of them (for example 100 per item). This has only 4 armor-type models like current pvp sets.
-Tier3 is the high-end epic set. Available only through the main 1v1 bracket. This has only 4 armor-type models but recolored and more fancy, like naxx/ulduar 10/25 sets for these tier2/3.
Each new season/raid-patch introduces a simple way to upgrade your pvp items much like the kirin-tor rings. No more of the "previous-season downgrade" thing. When you buy a new item in season 10 you buy the season 8 first and then upgrade to 9 and 10. The rating requirement for each tier/slot does not change. The Tier1 items will require stuff like frozen orbs/gems/metal bars/cloth bolts/leathers to upgrade. Tier2 and Tier3 will only require a few arena points so in season 10 PVE raiders can buy tier2 season 8 arena set with badges but still need arena points up upgrade to higher seasons. The new-season sets' models should follow the current "same model but more pretty" path.