According to Animeanime, the Black★Rock Shooter television series will be simulcasted on Niconico subtitled in eight languages. The streaming will begin Feb. 3rd following the Japan TV airing.

The latest episodes will be available at 11:00 pm every Friday in the following countries:
English: United States, Canada
French: France, Belgium, Monaco, Switzerland, Andorra
Italian: Italy
German: Germany
Spanish: Spain, Mexico, Chile, Argentina
Korean: South Korea
Traditional Chinese: Taiwan
Simplified Chinese: Mainland China, Singapore
The subtitled streams will not be accessible from within Japan.

Source: Animeanime