Yeah, I don't have any real details, although I can say for sure that NDK outgrew its convention space years ago (we're talking being in line for five hours in order to get into the major events, with the lines blocking up 75% of the hallway space), but they don't want to shell out for the convention center (I don't think there's a problem with affording it). Other than that one story, most of what I know is just rumors and the one time I talked with one of the head NDK people over a decade ago, so it could just be a typical con thing.