Jason,
Yes, true balanced with XLR connectors.
Rob,
The DACs will use ecc88 or ecc82 output tubes. My production sample used a 6x5 rectifier which Lukasz was pleased with and I believe will remain. Lukasz did not tell me the exact capacitor used, but it is a special high speed capacitor from from Japan and that he prefers it to most boutique caps.
Michael,
This DAC is in many ways similar to a gen 4 Level 4 DAC with some manufacturing optimizations and premium but not boutique parts. I wont say a Level 4 isn't better, but some people just won't care as the Amber is really good in its own right.
Once each batch of 5 is ordered, internationally delivery should be less then two weeks.