Got mine today. Tried USB playback using Poweramp on my phone but the output on the E30 never budged from 192 PCM even though I was playing DSD256 files. If I can't get DSD playback from my phone to E30, it's a waste for me. Will try more and report back here.
Update- Due to the software resampler in PowerAmp, it's output is limited thus no native DSD support. For DSD playback over USB, will have to download USB Player Pro, which costs INR350 on Plays Store.
Anybody knows any cheaper alternative app, let it be known.