I have only just sobered up enough to check out the Christmas Day update to the Android app for the DR-22WL. This update seems mostly to be a fix for the non-functioning "browse" function of the previous release. It now works, and significantly, it adds a "copy" button to the selected file. This copies the file to your phone (of course it's more practical if the file is in mp3 format), and then you can play the file on the phone. Currently this seems to require you to use a separate player app - I used Google Play Music, which immediately identified the transferred file as new, and allowed me to play it.
So, you can now remotely check that you have something useful recorded. Personally I would use this during soundchecking, recording in mp3, check that all was well, then (remotely through the app) switch to BWF for the real recording.
All pretty damn neat.
I'll check this version out in greater detail later and report anything else worth mentioning if merited.