Well when did we first start hearing news about the PSes 1-3, relative to their release dates? The PS3 was announced on May 16, 2005 (wow, that's so long ago!) and was released in Japan on November 11, 2006. That means that if a PS4 will be coming out on schedule, we should be hearing news very soon.
Wasn't the PS2 also a '10 year console'? Perhaps there was no official announcement that it was a 10 year console, but it technically nearly was/is! (The PS2 was released in 2000 and was still going on in 2009!)
