I doubt it, AFAIK only change was the op amps and some lpf tweaking. I'll try to try mine this weekend on dac mode. I haven't even tried Bluetooth yet, I just assumed it was weak like 80% of the daps I've used, the r3p kind of is a bit better but still cuts out, I'm assuming r5s is the same.
I'm talking about bt transmission, I've never had any problems in reciever mode but I'm also usually very close to the source.
What I do like is that they added system wide mseb support, and system support for plug ins. So far my general use with Tidal, neutron, and hiby music has been flawless.
Also looks like the new r6 is going to be a force to be reckoned with. Not for me at that size though
but I can see the value in that price for the package. Well I guess like fiio hiby is really good at value. Some people got r5 for 300 dollars and that's a steal in my book.