Expected release date: August 17, 2011 – Click the links to pre order :P
Jacket A Edition comes with a bonus DVD with the music videos for the Japanese versions of Bang! and Let’s Do It!, as well as a video of the members introducing themselves in Japanese. It also comes with a trading card (one randomly chosen from ten available styles). The single will also include an original Japanese-language song as the B-side track.
Jacket B Edition comes with a bonus DVD with the music videos for the Korean versions of Bang! and Let’s Do It!, as well as a video of the members introducing themselves in Korean. It also comes with a trading card(one randomly chosen from ten available styles). The single will also include an original Japanese-language song as the B-side track.
Jacket C Edition comes with the Korean version of Bang! and the Karaoke version of both songs in the single. The single will also include an original Japanese-language song as the B-side track.
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All the links above are for Amazon thanks to DarkFreeDoom and the links below are for CD Japan thanks to kinwah56
Japan debut single from AFTERSCHOOL. Limited Edition A includes “Bang! (Japanese Version)” and “Let’s Do It! (Japanese version).” It also comes with a DVD including music videos for “Let’s Do It! (Japanese version)” and “Bang! (Japanese Version)” as well as a special message video in which members introduce themselves in Japanese. A trading card is included (one design randomly selected from 10 kinds). Comes in a special slipcase.
Japan debut single from AFTERSCHOOL. Limited Edition B includes “Bang! (Japanese Version)” and a Japan original song (song title is to be announced later). It also comes with a DVD including music videos for “Let’s Do It! (Korean version)” and “Bang! (Korean version)” as well as a special message video in which members introduce themselves in Korean. A trading card is included (one design randomly selected from 10 kinds). Comes in a special slipcase.
Japan debut single from AFTERSCHOOL. Regular Edition includes “Bang! (Japanese version),” “Bang! (Korean version)” and a Japan original song (song title is to be announced later). It also includes instrumental versions of these two songs (subject to change). A trading card randomly selected from 10 kinds.

Credit : AFTERSCHOOLDAZE