ken_b - 6:41 pm on Apr 4, 2012 (gmt 0)
I got that email saying this was active for me an hour or so ago and can't find anything new. Just the same old interface.
Under Ad Review Center I just have the same old options. The first being "Awaiting Review". Click that, nothing new appears.
Usually I see a new ads waiting for review nearly every day, but none since this was first announced as coming.
I'm thinking the email was a bit ahead of its time. :)