According to The Hollywood Reporter, the sequel to Harold & Kumar: Go to White Castle has actors David Krumholtz, Neil Patrick Harris, Rob Corddry, Christopher Meloni, Ed Helms, Eddie Kaye Thomas, Paula Garces, Jack Conley, Roger Bar, Danneel Harris and Eric Winter all signed up to star in the sequel along with John Cho (Harold) and Kal Penn (Kumar).
From Hollywood Reporter:
The sequel is set in motion on the same morning that Harold and Kumar finally satisfy their munchies at White Castle and the object of Harold’s affection, Maria (Garces), sets off for Amsterdam. The pair decide to pursue her so Harold can proclaim his love. But when an overzealous passenger mistakes Kumar for a terrorist, the plane is diverted and the boys are off on a new escapade of mistaken identity. From Guantanamo Bay through the Deep South, Harold and Kumar encounter myriad wackos, jerks and whores as they are pursued by the Department of Homeland Security all the way into Bush Country.
A 2008 release is expected for the film.