It would be amazing if Brian were in the video, but I don't think he will be either (I hope I'm wrong).
In this short interview GaGa talks about Queen, Freddie and about Brian May being on her song. link
Well that's a bit of a hot Gaga mess. LOL Perhaps it will grow on me. The premise is supposed to be her walking all the way from New York to Nebraska to reclaim the man she loves, but I'm not sure that quite comes across. The part where she's making out with herself is a bit...off. And the logistics of a home run with a mermaid are a bit...unclear. But admittedly rather visually appealing, so I guess it's OK. :)