An hour-long timed trial of the full Counter-Strike: Global Offensive game will be offered exclusively to PlayStation Plus subscribers on PS3.
If you're on an American time-zone, the timed trial will be downloaded automatically - via Automatic Download - while you sleep on 20th August. That's the eve of CS: GO's global launch. So, presumably, the trial won't be playable until 21st. But this isn't specified.
Also unclear is whether European PlayStation Plus members will get the same deal. And if they are, when the timed trial will be accessible and playable from. So, I'll try to find out.