It seems that a revision is coming for the 9600 GSO. Where 65nm G92 GPUs were, three new GPUs are going to be: G94-210-A1 (65nm), G94-210-B1 (55nm) and the G94-219-B1 (55nm). This should happen according to unnamed "sources" friends with Chinese site Expreview. 

Not all the board partners will be able to sell the new GSO though. Only a few companies will be allowed; the short-list for the new GSO include Asus, Leadtek, XFX and MSI.

It is too early to tell what sort of differences to the 9600 GSO these changes will bring. The 9600GSO is currently a speedy, inexpensive video card that compares well to ATI's option, the HD 4670, often selling for around a $100 USD. Judging from this, a reasonable guess would be that the new 9600 GSO will be about as powerful as the old 9600 GSO, but NVIDIA will be able to manufacture it for less, allowing them to price products more competitively. 

The second unknown is what name the new 9600 GSO will bear. Expreview seems to believe that when NVIDIA will revise the 9600 GSO GPU, they will keep the same name for the card -- this would not be the first time for NVIDIA to do this. However, with news of the new NVIDIA naming scheme,  it seems that with the core revision, it would be good time to change the name. The 9600 GT is set to become the GT 130, so maybe the new 9600 GSO could be the GS 130? (The new naming scheme was supposedly launched to help clear up some naming convention confusion -- but at least at first, it seems like it'll be a bit of puzzle to figure out what is what.)