The 'Fluid Piano'

Sounds interesting. But when you tune a string that way, the relative hammer position changes. And so does the timbre of the key. So this might be useful for small changes, but gives an uneven sound on wide retuned scales.
And I missed to hear more then indian scales in this video. Something like a well tempered tuned Bach against some perfect tuned as example. Or some chords played with a perfect 7th. But maybe, this is not shown here, because of the general public that might not really notice the difference that much at all.