I don't think that points towards a black version. They wouldn't discontinue or hold back stock of the iconic white Wii just to release a black special edition.
More likely that the Wii's supply chain is still rattled from the insane December sales it saw in NA.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.