Sweep on 03 June 2010
IRC, Sony invested 20 million $ (and it was not a loan...)for L.A. NOIRE
It seems that the project took too much delay and Sony had the right to step back and recover the money.
To avoid that, Rockstar project was to give Sony an exclusive zombie game but it was canned (too much competition, LFD etc...).
So, to settle the things, they gave Agent to Sony.
Not sure of the whole deal (we'll never know exactly) but I think it's not far from reality.
