Some good news for Nintendo. It's reported that 3DS is on track to cross the four million mark in Japanese domestic sales by the end of the year. Using statistics from Enterbrain, Japanese publication Nikkei reported that 390,000 units had been sold from the 12th to the 18th of December to put the lifetime figure at 3.6 million.
It's perhaps not terribly surprising that we've seen Japanese sales spurts for the 3DS, with both the price and the recent release of Monster Hunter 3G contributing heavily to the handheld's upswinging figures. However, Nintendo's stock is still in rather steep decline.
That said, should the 3DS break its 4 million target by the year's end (which seems highly likely), it will have done so at least two months ahead of schedule, with Nikkei quoting Satoru Iwata in an interview (translated by andriasang) as saying "that he expected the system to reach the four million mark within a year of its launch, or by the end of February 2012".