I am personally seeing it in my account, but not in some of my client accounts. Here is how they are handling it now, in the new interface.
You click on the bid price or the little icon near it:
And it opens up a window with more bid options, a simulation of how the bids might impact cost, clicks and so on. This picture is taken from E-Commerce Circle:
It seems like this is now being rolled out to more and more advertisers. Google confirmed this is a feature they are testing, but have not confirmed when all advertisers will see it. For more details on bid estimator, see this help document.
Forum discussion continued at Search Engine Watch Forums.
Update: Google confirmed it is live for all. Here is a video demo of it: