The preprint on this has not come out yet. What we have is a 5 January blog entry by Sigurdsson. http://scienceblogs.com/catdynamics/2010/01/has_a_supernova_type_ia_progen.php [Broken] The work concerns T Pyxidis and is by a group at Villanova University led by Prof. Edward Sion. What I get from this is that T Pyxidis is extremely interesting but far enough away not to pose a material threat to Earth. The explosion they think T Pyxidis is preparing for for is type Ia.