Its already been revealed that the GF104 Architecture comes with Eight clusters and 384 shaders in total. Some reports say that Nvidia is planning to launch a GF104 Architecture based card with all the Eight clusters enabled which means the card will have a total of 384 Shaders.
There are no details about the name of the GPU but we can call it GTX 475 now, Also this card might be the replacement of the earlier released GF100 based GTX 470. Although the sales of GTX470 were not that impressive but there are hopes that the GTX 475 as we call it now may be pretty impressive when introduced.
By far there have been no offical statements by Nvidia on the new GPU but we can expect a new card by the end of this summer.