Sergey Alakov spotted yet another hotel search results test in Google and posted it on Twitter. This test includes the price labels in maps and adds (a) a price slider filter and (b) price labels in the carousel listings.
Here is a screen shot of the hotel search results test found in the core web results when you do hotel like queries:
The $0 to $600 slider will refresh the results dynamically based on how you slide that bar. And as you can see, the price labels are shown here not just in the map above but also in the carousel image listing at the bottom left.
Forum discussion at Twitter.