KyoAni's site that a new trading card game for The Melancholy of Haruhi Suzumiya, titled Hacha Mecha Battle Party, is being launched. I suspect it's more of just a promo campaign than something expected to reach Yu-Gi-Oh! levels of game-playing prominence, but it looks kind of cute-- you have character cards and "happening" cards and presumably your goal is to keep Haruhi from destroying the world.
A second game set has also been announced, a "Character Serifu game." (I'm not entirely sure how to romanize serifu here-- sure, it looks like "serif," but it translates to character dialogue. It's sort of like an anime version of the Japanese card game karuta, in which you pick up one card from a stack and everyone races to match it to the proper card laid out with others on a table or the floor. In this case, though, it looks like you're working to either match text quotes to characters, or alternatively dialogue played off of a special CD. I think the real draw on this one is the art, however; the case features all five of the SOS Brigade in beautiful, traditional kimono, and it really looks cool.
Bandai Entertainment's parent company really loves bringing that kind of thing out here, after all. I know we have a few YGO players out there-- I want to hear from you!