the legit dvd will be so easy to find in chinatown dvd retail stores and most likely, it'll be an all-region dvd. don't ask about whether or not it'll be bootleg, it's so easy to distinguish the legit dvd's to bootlegs. hong kong dvd distributors are very package-saavy, you've got to be color-blind if you can't distinguish them.
most likely, it'll be a 2 disc set. Megastar will be releasing the DVD in Hong Kong (as they've always done for films produced by Media Asia) and they've had produced alot of solid quality DVD's.
Japanese dvd will take a while to release because the film is releasing in Japan on September. i'm sure the dvd will come out in hong kong by then.