After reading this http://forums.worldofwarcraft.com/thread.html?topicId=27607280587&sid=2000 FAQ, I must say I believe the rated BG system is terribly planned. And I am not what you call a ''casual'' PvPer. I reached Gladiator on two of my three active arena seasons and played extremely optimized premade WSG/AB teams for nearly one year. I however believe important changes will be made before or soonly after it goes live because Blizzard is not stupid and I don't see the current system working out.
Rated Battlegrounds are broken down into three brackets. 10v10, 15v15 and 25v25. These brackets rotate weekly and can be viewed in-game via the calendar by activating the battleground holiday filter.
Players must create a raid with the full number of players required for the current bracket before entering the queue. Any level 85 player of your faction may participate in the battle (regardless of guild association).
When players win a battle, they are rewarded conquest points, up to their weekly cap. Weekly caps are individual for each player and are based on your highest single pvp rating from the previous week (the cap resets on Tuesdays). This rating can be derived from your 2v2, 3v3, 5v5 arena, or your rated battleground rating.
Players start at zero rated battleground rating and progress upward from there. Rating is only reduced after a lost battle when the player is above their internal matchmaking rating. For the most part, a rating only goes up.
Epic ground mounts will be rewarded at the end of each season to the top 0.5% of players. Titles are also available as you gain rating in the system. The titles are rewarded directly from achievements earned from gaining the required rating.
Winning a rated battleground with a team composed of 80% guild members will result in the additional benefit of guild experience gain for your guild. The UI will display a guild banner near the minimap that lets you know if you are eligible for guild achievements and experience.
These brackets rotate weekly and can be viewed in-game via the calendar by activating the battleground holiday filter.
This is probably the worst part. This will screw up groups, force good AB teams to accept random bads in order to fill up 25-man raids, etc. This is not like rotating maps in arenas, this would be like rotating 2v2/3v3/5v5 weekly. This would mess up team composition and synergy, screw over classes which aren't as good in a specific BG, screw over any esports potential rated BGs could have had, etc.
I expect this to change before or soon after rated BGs are released because I can not see any type of player enjoying it or agreeing with it.
Winning a rated battleground with a team composed of 80% guild members will result in the additional benefit of guild experience gain for your guild.
This is simply forcing the guild progression system down our throats at the cost of enjoying the PvP experience. In vanilla most (read: not all) good teams were made of players hand-picked from various guilds because of their PvP skills. Players shouldn't have to choose between a PvE guild and a PvP guild. I can already see daily problems caused by this system (we want to play with player x who is a friend and a good pvper but he doesn't belong to the guild and would put our team under 80% so we'll invite random guildie y instead /// player z who doesn't give a @#!@ about guild progression system switches guild every other day to accomodate his rated BG teams /// etc.)
This won't be nearly as much of a problem as the first issue if most people don't give a %%## about guild experience. I hope this will be the case.