A few things to add (from pg 12 of the manual):

1) You can always see what channels are playing and whether they are matrix or sourced by looking at the front panel display
2) There are tiny icons along the top for indicating PCM, Dolby, or DTS modes, but they do not indicate TrueHD or Master Audio versus the lossy formats. The alphanumeric display will normally show the selected source. The bitstream/format details will only be displayed when the SURR MODE button is pressed.
3) The front panel 'Info' button will also bring up the bitstream/format information (pg 8)