Finally.
Aiuto will be distributing them. Prices/release dates expected soon. More at Aiuto.
Of course, if you're looking for my thoughts:
ohm image: Master & Dynamic MH40
headfonia: Master & Dynamic MH40: Boxing Your HD600s
headfonia: Master & Dynamic MH30 – Goldilocks
And by all means, check out the interview I did with the Master & Dynamic team last year: An interview with Master & Dynamic – The Price Of 8 Bothans