With 2/3 of the goal for the year already shipped, it wouldn't be a surprise. UPDATED WITH NINTENDO COMMENT
Multiple sources have confirmed to Eurogamer that the Wii U may end production as soon as Friday.
According to the report, the final deadline for orders was the close of business yesterday (October 31) and with only a few small orders placed, the final Wii U system would roll off the line on November 4.
Nintendo had projected shipping 800,000 Wii U this fiscal year, and had shipped 540,000 as of the end of September. Overall, the Wii U has sold 13.36m units since its launch in 2012.
UPDATE 11/2/16: A Nintendo spokesperson denied the report in a statement to Japanese news source IT Media (translated by Kotaku): "There is no change to our continuing Wii U production." The statement acknowledged also that there are still Wii U titles in development, notably The Legend of Zelda: Breath of the Wild.