I just did a 'surround music' test drive in a new Range Rover Evoque equiped with a 'Meridian Surround Sound system 825' (16 speakers).
It plays 5.1 and Quad FLAC at various sample rates/bit depths from a USB stick and DTS from DVDV discs. Since I have all my surround already converted to FLAC this would be awesome since my current Audio A5 only plays surround from DTS DVDVs only (or stereo flac) and it's such a pain to convert stuff to DTS and burn, then manage all the discs in my car...
They Meridian user interface is very nice, shows the album art when flac files are tagged, has a touch screen etc.
Going back soon to test more, but so far passed they three critical tests: Looks nice, wife can see over side mirrors (she's rather small) and it plays surround. Could be my next vehicle.