The Disgaea heading to PlayStation Vita will also be launching in the US sometime in spring 2012. Beyond renaming the subtitle "Absence of Detention" (rather than the original's "Absence of Justice"), the Vita port adds "all-new characters, stories, and game systems."
Beyond the Disgaea series, NIS is bringing "everyone's favorite JRPG with Mega Man creator Keiji Inafune as a weapon," Neptunia MK-II, to the US. Like in Japan, the game will remain exclusive to Sony's PlayStation 3, and it's expected to launch in spring 2012 as well. The company also announced intentions to bring the tentatively titled "Clan of Champions" from Tenchu dev Acquire Corp. to the US, and to both the Xbox 360 and PlayStation 3.
[Disgaea 3: Absence of Justice for PlayStation 3 pictured above.]