Sales figures for Ultra Street Fighter 4 (retail and full digital editions) revealed in Capcom's FY2014 Q2 results presentation
This 500,000 figure accounts for the retail editions of the game as well as "full-game download" editions, which appears to imply that the digital upgrade editions of USF4 that came out in June for PS3 and X360 were not included in the tally.
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Besides, compared with other Capcom titles in recent years, 500,000 is but only a modest figure -- Dragon's Dogma: Dark Arisen did 650,000 during the quarter (FY2013 Q1) it was released in, and Resident Evil Revelations sold 1 million units in the same quarter.
No sales forecasts were provided for Ultra Street Fighter 4, so it's hard to say if the game managed to meet its sales expectations. Regardless, it appears that Capcom sees this as a positive result for them -- certainly important enough to mention it in their presentation to investors.
Source: Capcom's FY2014 Q2 business divisional strategies and projections report via Chigesoku.