information posted on VR-Zone is correct, then AMD has decided to move forward the launch of the RV670 graphics chip to the 15th of Novemberm that's four days earlier than the previous launch date.
This is still not enough to launch it ahead of Nvidia's GeForce 8800 GT, since this will launch on the 29th of this month.
Aparently it should be a hard launch this time and it's about time that AMD had products available at launch for once.
The AMD 790FX and 770 chipsets, previously known as RD790 and RX780 have aparently been postponed until the 20th of November from an original launch date of the 5th of November.
You can find VR-Zone's article here