Coming in Cataclysm, Blizzard is changing how Battle Rez and Soulstone work; you will now only be able to use 1 Battle Rez OR Soulstone (not both) per fight in 10m, 3 total per fight in 25m. With this change, they're rolling the cooldown on Brez back to 10m (from 30). They're also resetting the cooldown on Battle Rez from 30m back to 10m. Now, a lot of people are up in arms about this change; I've even heard it described as the beginning of the end for WoW. However, this change fits in well with the theme of 4.0, which has been the reduction of buff stacking and eliminating the need to bring certain classes or fail.
Additionally, a change like this is NECESSARY to progression raiding. Before this change if you were learning a fight, you want all your resources available for every attempt. That means if you have 2 druids and 1 lock, you want both battle rezzes and the soulstone up for every pull; without them, what's the point in even trying? As a result, many raid groups would have to take 5 minute breaks between wipes to wait for skills to cooldown. But is that fun? Is it cool to schedule 3 hours of raiding but spend an hour of it sitting around waiting for skills to cooldown? Of course not, it's absurd and bad design.
The other problem this addresses is class stacking. In a 10m on live now, you could easily take 3 druids to a raid and get 3 battle rezzes without doubling up on specs or gimping your raid buff composition. Throw in a lock too, and that's 4 combat resurrections; nearly half your raid could die and come back to life. That's too powerful, making druids too "useful" for simply clicking one button and encouraging raid leaders to stack them.
This change is GOOD. It's good for the raiding game, and doesn't affect anyone else since you can still use 5 brezzes in a heroic if you're running with all druids.