Disgaea 5 is also in development alongside Disgaea D2

[burnfist23.livejournal.com]

http://www.siliconera.com/2012/10/23/disgaea-5-is-also-in-development-disgaea-dimension-is-a-new-series/

The article also says that DD2 is a new series separate from the main numbered series. Whether this means more adventures for the Disgaea trio or letting Adell, Mao, or Val have another go is unknown but regardless this is all kinds of awesome.

UPDATE (Thanks maharl)
A new siliconera article says that Dimensions will introduces new characters to the story. One of them, who is in the group shot, is Laharl's ????????

There are also rumors of monster mounts.

UPDATE 2: (Thanks nalina)
http://disgaea.jp/d2/

The background has changed to the group artwork but with everyone shadowed out with the exception of Laharl. Most likely, the others will become visible as we count down to when the official site goes live. There's also a new BGM.

Comments

[maharl.livejournal.com]

This is all kinds of awesome, but now I am afraid there will be too much Disgaea, hope try some new gameplay variants to keep it fresh, the Disgaea spin offs like the Prinny games were just as fun as any other game NIS have made IMO.

[burnfist23.livejournal.com]

I'm pretty sure they're going to keep the cycle they've had going since Disgaea 2 (Disgaea->New game->Disgaea->New game), not to mention that they have two new titles in development and one or two more projects in their anniversary project lineup so I don't think we have to worry about seeing nothing but Disgaea.

Plus, NI has that new studio in Osaka, so I'm pretty sure if the main Gifu studio is working on Disgaea, their Osaka studio will be working on other interesting projects.