Is David Ramsey (John Diggle) Visiting The Flash?

Is John Diggle visiting The Flash?

David Ramsey posted the photo below on Instragram, and captioned it like so:

Made a visit to #theflash writers room.. Can only mean one thing.. #arrow&theflash

It could be our imagination, but we thought we did hear something earlier in the season about Diggle and Lyla visiting The Flash in an upcoming episode… maybe this is it? In any event, it looks like another crossover is coming in the future.