Dark Messiah thing

Hey dudz.
I've done this trade about an year ago I suppose, where I gave some tf2 metals and stuff and got "Dark Messiah of Might and Magic".
Thing is, the guy I traded with was an ass so he didn't tell me it was a free multiplayer only thing he got from some website.
So, I played it for a little while, but I was waiting especially for the single player, and since it wasn't there, I stopped playing in like a day.
So now, this morning, I just got the singleplayer, out of nowhere.
So, I wanted to know if you think it's gonna stay there or they're gonna remove it?

That's all.
Thanks =]