Oh look! A website I've never heard of is saying the PS4 is coming next year with absolutely no evidence to back it up!
Kotaku is a well-known web site (parent company Gawker Media - Engadget, Jalopnik) and producing parts is hardly the same thing as shipping boxed units.
If you think anyone can assemble 3 million working PS4s - whatever that entails - and have them boxed and ready to ship in less than a year's time you're out of your mind.
If they're not already working on prototypes by now they'd never make a 2012 launch... I mean, when did you think they develop launch games? It takes longer than a few weeks to make a game. You can bet your ass there's people at least in the planning stages for games for PS4 right now.
Welp it wasn't that long ago that we received leaked word of the unannounced PS3 Slim via a somewhat blurry pic purportedly taken from a Filipino street vendor. Many people scoffed at that "source of information" as well... and it turned out to be 100% true. The internet age has changed the news landscape drastically. So as high volume computer and electronics components are indeed manufactured in places such as Taiwan, the Philippines, Indonesia and China we must, at the very least, take information emanating from these locations as very possibly being legitimate.
For every one story that is true, how many aren't? Yes, the internet has changed the news landscape dramatically, however that doesn't mean there still isn't misinformation out there.
I think it makes sense to at least start on something. This gen of console's won't last forever, so to have
something to release later down the road, they have to start somewhere right? Personally I'm still expecting
a few more years out of the PS3, simply to justify how much money I paid for it.