In case they happen to buy it in late November, the late adopters of the cheapest Geforce 8400GS will get a better product. Nvidia plans to silently replace the existing 8400GS with a new one. The one that you can buy today is based on a G86 chip, while the new one is based on D8M/G98 chip and will bring a full VC-1 decoding and PCIe 2.0 support to this refreshed 65nm product.
The old 8400GS cards are selling for below €40 today and some of the users will benefit from this all new VC-1 Support, while PCIe 2.0 is not so important.
The card will also need less power but the cooler stays the same and the reference PCB doesn't need a power connector, as the card doesn’t need that much power. The reference design of the card is low profile and it uses an PCB to VGA flat cable.
In retail / etail purchasers won’t notice the change and will not know what they are buying. Nvidia will try to sell out all of the G86 based cards before it replaces them with D8M/G98 cards.