In a recent interview with Flash artist Francis Manapul he teased the following:
[Q] Before we let you go, and you pass out from over-stimulation, are you working on anything else these days, comics-wise?
[A] Yes – I did a two-page story for “Superman/Batman” #75 with J.T Krul. I’m also working on a black and white short story starring “The Spirit” with J.T, as well. But those are all side things. More of “The Flash” is in my future…and hopefully a little bit of Krypto.
How dark could these stories be? :) Kidding, kidding.
Source: CBR