Google quietly announced on Google+ a new feature added to their AdWords Bid Simulator.
The new feature shows you how bids impact conversion values within the tool. The example Google gave was:
For example, this improvement will help you see how a $.50 bid increase might impact sales for your business, so you can choose the right bid to maximize ROI.
Google created a new help document on how to estimate your results with bid simulators.
Forum discussion at Google+.