I suspect the "A" version will replace the existing one without any special publication. It's essentially a matter of replacing the existing receiver with an asynchronous one. The clock is a part of any digital transmission device such as the D/A converter so no need to replace that. As far as I'm concerned, one of the disappointments is the lack of 176.2kHz support which is a studio standard in this part of the world.
As far as the "upgraded power supply" is concerned, I think this was more of a necessity than an enhancement. The power transformer in the original version is as small and as cheap as the one in a 20 Euro DVD player. Regardless of the fact it has separate regulation for each of it outputs, it has no place in something that costs 400 Euro and is intended to be used for a couple of hours every day, or all day long. I was not surprised to see such a tiny transformer which is literally as big as a thumb nail but still hoped they used something a bit more substantial. Generally speaking, even a mid 1990s CD player from the likes of Denon or Technics have far better power transformers.
What I resent to MF is the fact that now even if one wants to purchase their M1 DAC, has no way of knowing whether it is the improved version or not. They didn't even care to make the changes public on their website.
