http://www.thisisbigbrother.com/foru....php?tid=59845
There's another thread in Suggestions&Help about changes being made on top of that (it can be optional).
Also, we had a poll/thread about it in Chat&Games, but it got locked eventually. I think it's just too early to discuss it really. I think it'll be reopened once we've had time to get used to it. Personally I think it's OK as long as it's not abused, and with BB coming up it's a useful thing to have. Plus people were requesting it, and it's on a few other forums, so it blends in nicely with this forum and the other changes that have been made.