Yes, the first 5000 series card will make it's debut on Tuesday September 22nd. Additional versions will be released later. There have been numerous news reports. Complete details are not yet available but bits of info have been leaked.
BTW - I was at a Fry's store this morning. They had a pc set up with three monitors and a store clerk was running a flight simulator program using all the monitors. I wasn't impressed. What did impress me was the desk. It was a Planet 3 gaming desk for $159.99.