Falchuk says that those “Rachel-and-Kurt-do-NYC” spin-off rumors were once a very real possibility, but as of right now, “I think we’re going to pass. If you watched the [Season 2] finale, that was certainly something we were planting as a possibility, but that’s all it was.”

http://www.tvline.com/2011/07/glee-comic-con-sue-congress-klaine-mercedes-spinoff/#more-234354