You all know I am obsessed with tracking the search results (SERPs), not just the core ten blue link changes but also how the other elements come in and out of those search results. Tools like Mozcast and RankRanger, amongst others, also track Google features that are included, like videos, local listings, ads, HTTPS and so much more. Now RankRanger added hotel local packs to the mix.
Currently, according to the tool, 4.5% of the US desktop Google search results they track contain hotel local packs. Again, this is 4.5% of the keywords they track but it is a good benchmark to track and continue to monitor.
Here is their chart:
Forum discussion at Twitter.