Just to confirm Ian's reply to my early post, I've upgraded my iPad to iOS8 and now I see TIDAL as one of the alternatives in the Focus->Album Info -> Quality dialog.

To be clear to everyone running iOS7, the core control app under iOS7 does not show TIDAL as a Quality option.

Thanks, Ian!

Main System: MD600 & Sonos Connect -> 818v2 -> DSP5200SE+DSW SUB
Alternate Main System: Sonos Connect AMP -> Dynaudio Contour 1.3 SE speakers + Sonos SUB
Kitchen: Sonos Play:1
Bathroom: Sonos Play:1
Bedroom: Sonos Play:3