MODFREAKz released the diagram to read/write the NAND of the Xbox360 S (alias v5, Valhalla, Vejle or Trinity - whatever codename you prefer ) with NandPro via USB SPI.
This isn't currently not useful for end-user as all Xbox360 S consoles of course come with locked CB, so the JTAG/SMC hack is not possible on these consoles. But this is of course useful for new research and who knows what the future will bring...

News-Source: xboxhacker.org