Sergey Alakov spotted Google testing tabs for a knowledge panel for branded search terms. So not specifically for a local knowledge panel but for a brand name.
You can see what Google typically shows for a search in mobile for [google] the brand here:
Now compare that to what Sergey spotted, which looks more like a local knowledge panel design with the tabs:
You can see more screen shots of this in acton on Sergey's blog.
Forum discussion at Twitter.
