There is a new HIFIMAN EF600 desktop DAC/Amp available for preorder: https://apos.audio/products/hifiman-ef600-desktop-dac-amp
The TLDR; is:
Shaped like a headphone stand
2x R2R Ladder DAC
It's an EF400 with a different shape, 2 DAC chips, and more input
More inputs than the EF400s USB, (RCA...