Since the first OVA, there is already a second OVA planned to be released on the 17th March 2011, with more OVA's releasing over a spread timeline.
Since the first OVA, there was a second OVA planned that was released on 17th March 2011. A third OVA is to be released on 17th June 2011, with more OVA's released over a spread timeline.