Looking forward to 6 core cpu's

[Kuroimaho]

That was the case. The Istanbul die is a pretty big die (346mm2) so the manufacturing cost is pretty high. While the AMD can sell this die for $450-$1000 then they won't offer it for $300-$400. It's a simple economic reason.

So selling a 258mm2 Deneb die from 145$ is economical, but a 346mm2 for 400$ isn't.
Seems to me for simple economic reason they should be selling 6core for 400$ rather than denebs for less than half as much, BTW Intel can charge up to 562$ for the 950.
With their current server marketshare there should be capacity to drop 6 cores on the desktop.

The other reason is that the AMD want to launch a complete new platform (Leo) and not only a CPU.

Last I heard even AMD execs wouldn't buy their own platforms I doubt beside fanboys many cares. Delaying the 6 core cpus for almost a year because of this is really unlikely, especially if it goes against economic reasons. Intel tried several times to establish a platform on the desktop not many could name one, let alone AMD's.

Six-core CPU + 890 series chipset + 5800 series VGA

6 core cpu, people who buy platforms won't really need one.
890 chipset, what difference would it make over the current ones that platform buyers benefit from ? I believe close to nothing.
5800 series Vga, same as 6 core cpu, people who buy platforms most likely do fine with the IGP.

The DDR3+DDR3 compatibily doesn't really increase the IMC size because the two standard is very similar. So they won't design a new die to remove the DDR2 compatibility because it would be more expensive than to leave that area untouched.

Unless they have to touch that area because the g34 will use quad channel memory and it needs a little tweaking for optimum performance.

As you can see in my previous post the AMD has never ever developed a new desktop only "high end" die in the past. It simply doesn't worth (financially).

This is not a desktop only cpu, what you don't seem to get that this is the same die they use in the new server cpus which will launch this year and not the ones they did last year. Otherwise it would have been out last summer.