I spoke with Oppo last week about their FLAC streaming capability and they told me they will be releasing another firmware update that includes meta data with FLAC streaming. I don't know if it will include more sophisticated browsing though.

Ken

Main: G68J, 5K2s, 5Ks, HSU subs, Pio 151FD, Dish VP722, Roku, Wadia I70, Anti Mode Dual Core, Oppo 103D Vanity Lite
Office: SBT, Berkeley Alpha DAC 2/MQA, Magico S3 Mk II, Boulder 2060, Lumin U1 Mini streamer, Roon.