Called flexible raiding, it will be a new option for different sized groups of PUG’ers or smaller guilds:
…. we’re in the process of developing a new Flexible Raid system, which includes a new difficulty that sits between Raid Finder and Normal difficulty, while still allowing friends, family, or pick-up groups to play together. This difficulty will be available for premade groups of 10–25 players, including any number in between. That means whether you have 11, 14, or 23 friends available for a Raid, they’ll all be able to participate.
The Flexible Raid system is designed so that the challenge level will scale depending on how many players you have in the Raid. So if you switch between 14 players one week and 22 the next, the difficulty will adjust automatically. Keep in mind that unlike Raid Finder, no matchmaking is available, so you’ll need to make sure you invite people to attend—but if some can’t make it, it’s not the end of the world (or the Raid). You’ll also still be able to invite Real ID or Battle.net friends cross-realm. Who you choose to bring and what Item Level gear they’ll need to join your merry band is up to you, too—there’s no Item Level requirement for this Raid difficulty.
You can read the full explanation of flexible raiding over at the official site but in the meantime, what’s your take. Is this going to increase the likelihood of you raiding in WoW and do you think it’ll have effects on current raiding tiers?