It's rumored that NVIDIA is slowly prepping an entire move towards 55nm chip fabrication.
We already noticed that the new GeForce 9800 GTX+'s (G92b) chip is at 55 nm. Today the silent introduction of the G96 aka GeForce 9500 GT will take place (55nm). And as it seems, the GeForce 9600 GT will receive the die shrink as well.
Other than the a smaller chip-die size, the 55-nm silicon will have no new improvements Then again, typically 55-nm runs much cooler, so who know what gain on overclock you guys will see.
