Well that was quite unexpected when I opened my steam today.

You can now pre-load & pre-purchase bioshock (click the picture above) on steam, BUT you cannot register your retail bioshock key on steam because it uses a different authentication system.

But what the hell I can just add it as a non-steam shortcut, since I am using the Steam Community beta ^_^

You can find my Steam id profile here
http://steamcommunity.com/id/bloodshed