It might support 384, but I suspect it won't. I've spent an inordinate amount of time researching this, and I think for 2-channel Blue Ray music 24/192 will be the high-end standard. And, fwiw, the new Cambridge Dacmagic can't take that in, but the Benchmark and Bryston DACs can.
Note that the single company producing BR music right now says that they can't really tell a difference between 384 and 192 - they even say the difference between 192 and 96 is miniscule, but going below 96 is bad. And going full DXD does sound better than 192. He also says that PCM 24/192 is, in his opinion, better in some ways that DSD (SACD) but less good in others.
So I think PCM 24/192 is the 'new' standard. Of which there is only 1 disc available at this time.
For music, if you have an external DAC that re-clocks, then I don't think the transport matters, people have been comparing 15k transports to $300 transports with the Benchmark and can't tell the difference. The Bryston and Benchmark (and many others) both re-clock. So you don't need a 3k Blue-Ray player for the best sound. However, if you want to stick with internal DACs, and you want the universal player, then it would indeed be very worth it.