Got my copy of the latest Entertainment Weekly today. Their 'tv picks for the week of May 4-10' section has a big mention and picture of Margie and Luke in the recommendations for the May 10 episode, and EW has had those kind of light spoilers before this season in that section (ie. the magazine showing showing Mel and Mike would make it to Russia #2 arrived at my house before Russia #1 aired)
In their Must list section earlier in the issue, Luke, Margie, Jamie, and, oddly enough, Kisha and Jen get mentioned as part of Must #4 for the week. (Race season finale) Tammy and Victor are mentioned in neither blurb. So Margie and Luke are almost certainly through to the finale, and I'd say that if Must #4 is referring to the actual finale episode (and they seem to be getting earlier screeners this year) then the picture upthread might indeed be a shot filmed after the finish.