Oops. Then the answer is significant differences across the board. New buffering, new DSP, new output (SpeakerLink), etc. etc. 808i.2 has the new apodizing upsampling filter which is supposed to be a significant improvement. 808i.1 doesn't (and is very unlikely to).

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.