Nicolai Helling posted on Google+ a new shopping and maps feature that Google seems to be testing that allows searches to click on a button to search the local stores inventory directly from the map results.
The button is found in two places (1) Google web search results knowledge panel and (2) Google Maps result listing. The button reads "Search items at this store."
Here is the web search view:
Here is the map listing view:
When you click on this specific example, it gives you the categories of products - kind of like you'd see on an e-commerce site:
And then you can drill in:
Nicolai Helling said "IKEA seems to be piloting a new combination of Google My Business and Google Shopping lists in Germany."
Forum discussion at Google+.