Disgaea Dimension 2 is currently in the works, but it's not to be mistaken for Disgaea 5, according to Japanese gaming publication Dengeki PlayStation.
Disgaea Dimension 2 is for the PlayStation 3 and is a direct sequel to Disgaea: Hour of Darkness, which was originally released on the PlayStation 2 before receiving ports on the PSP and Nintendo DS.
Dengeki PlayStation also reports that Disgaea 5 is currently in the works, although there is not a lot of information available on the strategy role-playing game.
Disgaea Dimension 2 has a planned Japanese release for the PlayStation 3 on Mar. 20, 2013. Disgaea 5 does not have a release date yet.