There are no news at all. Actually, hardly any reputable sources ever claimed that a GTX475 card was in the pipeline. It was only mentioned that NV may at some point release a full-fledged GF104 core. Unlike the 450/455/460 cards which were confirmed a long time ago, GTX475 was never confirmed. Latest drivers also didn't leak any GTX475 and 485 names.
It makes sense that GTX475 didn't come out yet, however. Think about it from a business perspective. NV sells GTX480s and not 100% fully functioning GF100 cores as GTX470s. If NV were to introduce a GTX475 from GF104 core, what are they going to do with all the non-working GTX480 cores? It would make GTX480 too expensive to manufacture.
As a result, imo, GTX475 can't come out until GTX485 is also ready. This way, both GTX475 and 485/495 will replace the 470/480, respectively. Perhaps NV will release a GTX475 and 495 to replace the 470 and 480, where 495 is GTX460x2.
Secondly, if you are still looking to buy a $300+ graphics card (i.e., GTX475), then might as well pick up HD6000 derivative card. It hardly makes sense to spend $300+ on any NV card at this time. Alternatively, find a deal on a GTX460/470/5850. Those always pop up.