3DS sales have picked up lately, but Nintendo‘s financial numbers are still weak. Big N today released [PDF] another set of disappointing results for the first nine months of its fiscal year (April to December 2011). The company lost a whopping US$630 million, compared with a profit of US$635 million in the same time frame last fiscal.

Sales were down 31.2% year-on-year to US$7.2 billion.

Nintendo says there are three main reasons for this performance: weak Wii sales, the unprecedented price cut for the 3DS in spring last year, and losses on its foreign currency holdings coming from the very strong yen.

But today, Nintendo president Satoru Iwata was able to announce good news, too: Iwata said this company is ready to phase out the Wii and to start selling the follow-up console, the Wii U, in Japan, America, Europe and Australia by the “year-end season” 2012.