The Lumin is a good deal more expensive than the Revo. Both the Lumin and the Revo require a good external LPS to sound their best. Hans Beekhuyzen did an extensive review of the Revo on his youtube channel.
In response to an inquiry with Volumio they responded:
"Rivo can work as UPnP/DLNA renderer and it’s gapless.
The DoP format can be played only from USB output. The USB output plays also DSD native up to DSD256."
Did you every get a new streamer?