It will be up later today for European PS3 gamers and for PC. That's one full week ahead of the standard PSN crowd. R.U.S.E. is out September 10th.
"This is exclusive to Plus members until the 1st Sept, when the demo will be available on the Store. As with the last demo, you will be able to download this from the Plus section of the Store or you will get it via Automatic Downloads if you have this feature switched on," posted Sony PSN manager James Thorpe.
That's your Plus tax dollars/euros/pounds at work. R.U.S.E. releases on Xbox 360, PS3 and PC September 10th. It's all about deceiving your foe and overwhelming them.