The guys over at 
OCWorkbench claim to have received official confirmation from Nvidia regarding the release 
of the GeForce GTX 285. The card will launch on January 15th, just one week 
after the debut of dual-PCB GeForce GTX 295 and the first day of CES 
2009.
As reported earlier, several Taiwanese retailers have already begun 
listing ASUS and XFX GeForce GTX 285 cards, with pricing roughly 
similar to the GTX 280 regardless of region or country. The Taiwanese retailers also mentioned the January 15th as the availability date.
While the new 
55nm card is expected to have an average 10% performance gain over its 65nm GTX 
280 predecessor, it is important to note that Nvidia's 40nm GT212s are just 
around the corner and may even be introduced at lower price points due to 
effective reductions in manufacturing costs.
Also read:
Asus and XFX GTX 285 and 295 listed
Nvidia's 40nm GT212 to have 384 SPs, 96 TMUs