Gamasutra has an article that talks about Namco Bandai quarterly earnings, and it mentions Dark Souls II has sold 1.2 million units worldwide.
More information.Although Namco Bandai's profits took a tumble during the last fiscal year, the company's video game business was, in fact, the only sector that saw a rise in earnings.
It was mainly the publisher's amusement machine business that caused the drop in profits, as it swung to losses. Video game sales were actually slightly up year-over-year, accounting for 84.9 billion yen ($833.9 million) compared to 84.4 billion yen ($829.1 million).
Dark Souls II in particular sold well for the company, with 1.2 million units sold worldwide. Meanwhile God Eater 2 managed 700,000 units sold in Japan, and Dragon Ball Z: Battle of Z sold 620,000 units worldwide.