As of December 2012, the Wii U had sold 3.06 million units worldwide (we made an educated guess at 3 million a couple of weeks ago). That breaks down to around 1.32 million in North America, 900,000 in Europe and 830,000 in Japan. The Wii shifted 3.53 million from April to December. Nintendo has previously stated that it aims to sell 5.5 million Wii Us before the end of March, but it has now revised this target to 4 million.
Games sales were hoped to reach 24 million, but the new estimate is 16 million (11.69 million have been sold so far.) The best-selling Wii U launch game was Nintendo Land, with 2.33 million sold.
3DS sales are substantially up - software sales increased by 41% year-on-year, with hardware up by 11%. But Nintendo has still cut the sales target for its handheld from 17.5 million units to a more reasonable 15 million.
It seems, then, that the Wii U launch has gone well, but not as well as Nintendo had hoped. Keza MacDonald is in charge of IGN's games coverage in the UK. You can follow her on IGN and Twitter.