Unfortunatly:
After much though and deliberation, we have decided to remove the 25 v 25 bracket from rated battlegrounds. We felt that overall, it created too many logistical issues for players and that in the long run, most players would just skip that week in the rotation.
http://forums.worldofwarcraft.com/th...=2000&pageNo=7
post 125

I do understand the reason why they did this thought. On my current realm 25 decent pvpers isn't that hard to gather. But on my old realm, you would need pretty much all pvpers that are on there So then rated ioc/av is near to impossible.