It didn't work straight away with DSD over network, I'm not sure if that was down to J River or Sony? The trick is to get the AVR to see .dsf files as .dsd files and then it should play over the network... Sony aren't renowned for their software side so I kind of put it down to them but who knows?
I'm not holding out for them to ever issue a fix for gapless, as good as that would be... With the 4.0 files at least there is a way we can do it ourselves...
Sony's track record of "fixing issues" or adding features via a firmware update is a poor one...when they actually want to add features or provide a fix they usually just do it in the next model...