Mike Blumenthal saw this last week, where Google was testing, showing not only the local package carousel, but also an advertising space in that local package carousel. We have seen many variations of the local packing carousel – a sliding carousel with local results. But this one has an ad unit and that ad unit remains above the results of the organic local package.
Here is Mike's screenshot:
I suspect that at some point Google will launch the carousel interface for the local package, but we'll see.
Forum discussion on twitter.