The timeframe was reportedly mentioned by president Tatsumi Kimishima during Nintendo's earnings briefing held earlier today, but was not discussed in the company's financial release posted online. VideoGamer.com has contacted Nintendo UK for further information.
Wii U launched worldwide in November 2012 but has struggled to sell as many units as its predecessor, the Wii. Current lifetime sales stand at 12.8m units, little over a tenth of the 101m sales secured by Wii. Nintendo expects to sell only 800,000 units during its current financial year.
Source: bbc.co.uk, reuters.co.uk