It appears like Google has been testing a feature on some of the advertisers. The feature seems to be an elaborate budget analysis. It appears in the edit campaign section in the budget setting section.
Google AdWords informs:
Detailed budget analysis: When possible, we will analyse and display the percentage increase in clicks that you would be eligible to receive with an increased budget. We make this detailed analysis based on your campaign performance data over time, so it is only available when you have not altered your campaign within the last two weeks.
Basic recommendation: In many cases, we will supply a budget recommendation based on historical data for the same or similar keywords as yours. The basic recommendation considers variations in language and location, but it does not consider traffic you might receive from the content network.
Check out the screen shot at Kevin Gibbons blog post.