Looks like the new X1 box auto switches to HD. Check this video review:
those screens look similar to the black version of navigator except they are more in depth and more updated. I hear that Navigator is still too buggy although they do have poster art in search and on demand searches on the DCX-M and Samsung along with 4640HDC and 8640HDC and higher cisco boxes.
I believe that Navigator 6.0 is coming out as we speak.