Hiiii

When will we be able to d/l the game ? :)

I don't think gog has predownload (they can set up the .bin files and leave the .exe off but only by special arrangement - like for their own Witcher games)
So it'll be available on March 26th 9am PST (official release date - not sure if gog will have it at midnight PST?)

Better question, will it be in Galaxy right from the start?

I tend to feel that new games are better on Steam because they get patched faster and easier. However if its available in Galaxy right from the start at least the patching will be easier and I'll redeem my key on GOG.

Wouldn’t work ;)
A bunch of GOGers (mostly Linux users) already know how to extract the full game data files from the .bin only, without the .exe. All you need is a RAR unarchiver (any one will do the trick).