There is a Guns of Icarus Visual Novel in dev. Its a fan project. I'm actually one of the writers on it. We haven't posted updates in awhile because the guy running the group has pretty much vanished and it looks to be changing hands. I can say we've got 5/6 stories in draft form. Average of about 70k words. One peaks at 85k. Plus a neutral story which ties the faction stories together at around 30k. It does have Muse's blessing, but we don't have access to any internal lore Muse is designing. It needs to go through Muse before any parts of it would be considered canon.
Any fan made project right now is not canon. We may use ideas Muse has stated or implied, but its not canon until Muse writes it in. The Aerodrome event is a byproduct of the VN development and I had to add a disclaimer at the end of the last big trailer cause I had folks thinking it was canon. I don't know what Muse is going to eventually do regarding the lore. I can tell you after working on the VN for over a year now that, its rich. So much potential. You really don't see it till you sit down and start thinking about it and writing something. I very much enjoy it and would love to be apart of it in some small manner. Heck without it I probably wouldn't be around here still. I might have to go back and rewrite some of the VN stories pending on whatever direction Muse goes. But thats not a bad thing. Time will tell.