2 things for this thread.
1) Space Hulk is now available for pre-orders on
steam. EU2 price is €27.99
2) I've contacted JAFTeam over at the Bear's Pit for a little more clarifications about a possible GOG build. I was talking with Andreas, who is not one of the developers/programmers, so he can only tell me what he has been told. So, here's the info he gave me.
A) They don't plan on using any additional DRM, other than steam. To quote him
Quick answer: We don't have any additional DRM. You need steam to used the shop otherwise no..But still a bit uncertain until we have everything up and running.
B) The shop is not a micro-transaction one, it's a way to purchase the DLCs from ingame (so yes, Space Hulk will have DLCs, if you were wondering that). Again, to quote him
By shop I mean a shop where you can buy DLC for the game e.g. Skins or a Whole new campaign. Of course you'll also be able to purchase it on steam, but we might as well have the shop in there already for the iPad version.
So, it seems that Space Hulk won't be coming anytime soon, though it is possible that once their programmers finish the final touches of Space Hulk they will be able to do a different build. Andreas also said that they will be making JA:F with a GOG friendly approach from the start.