IGS is a little unclear about the BTA bonuses though. On their homepage they say it's the soundtrack and the prequel comic of Cognition, but when you look at the blog, it seems that you also get a copy of the first episode. Not that it matters, I think it would be the third or fourth copy I would get of that game.
"Get back to work solving the crimes facing FBI Agen, Erica Reed in Cognition Episode 2: The Wise Monkey for PC/Mac. Pay more than $1 to get a Desura key (and a Steam key if the game is greenlit) and beat the average for Cognition Episode 1.:"
Definitely get Cog 2 + Cog 1 as a BTA plus coming plus soundtrack.