According to the official Twitter of "Kaitou Tenshi Twin Angel," a new OVA for the franchise is currently under production. The mixed-media project started life as a pachiko slot machine series in 2006 and was later spun off into two manga
in 2007 and 2011, two OVAs
in 2008, a visual novel in 2009 (available on the Windows platform), a TV anime series
in 2011, and an action-adventure game for the PlayStation Portable console (also in 2011). At the moment, schedule, staff, and cast information have not yet been made available.
Official anime OVA site: http://twin-angel.com/media.html
Source: Kaitou Tenshi Twin Angel official Twitter
Kaitou Tenshi Twin Angel: Kyun Kyun☆Tokimeki Paradise!! OVA