According to the tweet of Good Smile Company's president, the sequel of Black★Rock Shooter
got the green light.
Aki Takanori said:
It (the rumor of BRS2) is not completely wrong, but our eagerness to produce a sequel seems to have been interpreted as an official announcement in the enthusiastic atmosphere of the festival. Anyway, we'll keep on working hard to realize BRS2.
Source: Aki Takanori's twitter
The rumor of Black Rock Shooter 2 spread from a tweet
of one of the visitors to Anime Festival Asia 2010 held in Singapore.