Nothing in the original Official Google Blog announcement about Google Patent search implies an integration into Google Scholar, and December’s Google Librarian Newsletter, which spotlights Google Scholar doesn’t provide any hints about this development.
There is an interesting interview with Anurag Acharya, Google Scholar lead engineer, in the newsletter though, where he states that he would like to see Google Scholar develop into a “a place that you can go to find all scholarly literature — across all areas, all languages, all the way back in time.”
I do see some snippets from other patent search sites, but I’m not sure when those started appearing. The patents are a nice addition to the articles from scholarly journals and book citations. It is sometimes possible finding white papers from the inventors of patents about the same topic, so adding Google patent search results into Google Scholar can be a place to discover when that happens.