It’s a sequel that’s been (mildly) discussed for quite some time now, but it seems that New Line is ready to get rolling on the as-yet-untitled "Harold & Kumar 2." And yes, both lead actors will be returning — a rarity in New Line sequels.
From ComingSoon.net & Production Weekly: "Production Weekly reports that the sequel to 2004’s Harold & Kumar Go to White Castle is planned for a late January start date in Shreveport, Louisiana. John Cho and Kal Penn are set to reprise their roles as Harold and Kumar, respectively.
In Harold & Kumar 2, the cross-country adventure follows the pot-smoking duo as they try to outrun the authorities after being suspected as terrorists when they try to sneak a bong on board a flight to Amsterdam.
Interesting trivia: In the UK, "Harold and Kumar Go to White Castle" is known as "Harold and Kumar Get the Munchies." (Cuz they don’t have White Castle in England!)