Andy Simpson spotted this interesting Google Maps interface test. It shows a local listing or local pack carousel in the footer section on the Google Maps view. I don't believe I've seen this before, but it is kind of nice.
I cannot replicate this, but here is the GIF of it he shared on Twitter and the Local Search Forums:
It is an interesting way to keep the local listings in view after you click on a listing to expand its local knowledge panel.
Forum discussion at Twitter and the Local Search Forums.