Given that the agreement is with an audiobook company, the project will be (you guessed it) an audiobook. Stan Lee is signed on to narrate the introduction to the project. Lee, along with Ryan Silbert and Luke Liebermen, promise that this will be the beginning of an entirely new shared universe. Presumably, if this project does well, we'll see more of it in the future.

It's unclear whether the long-form work will later release in print form. However, seeing as Audible is owned by Amazon, which has its own publishing arm, it's certainly a possibility.