We sure hope that white is your preferred color for a gaming console.
The last black Wii U consoles are being permanently removed from Japanese store shelves.
This is confirmed via the Japanese website of Nintendo.
The family bundles, which contained games like New Super Mario Bros. U and Wii Party U, were the final ones to actively include black Wii U consoles as part of their sales pitch. These have been already discontinued and are joined by the regular white and black premium sets. The basic white set and a recently released premium white set, which includes Wii Sports Club, are the only two bundles available in the territory.
No word if this is a trend that will continue onto other territories.