The recent Japanese release of volume 7 of Ore no Imouto ga Konna ni Kawaii Wake ga Nai includes a couple of extras for fans on top of the usual bonus material seen in previous volumes. Volume 7 starts the "true route" episodes, previously streamed online only, which offer an alternate episode 12 followed by several extra episodes as opposed to the original "good end." The major change to the story being that Kirino decides to go through with her trip to America, leaving her brother on his own back in Japan.
In what may well be an effort to sell more copies (it seems logical there must be fans who preferred the original ending, as well as people who don't know about the extra episodes at all) this volume includes an AMV mash-up of footage from the various opening sequences and clips from the anime played to the full version of the opening theme, irony by Claris. Also included is the full intro for Kirino's favourite anime Stardust Witch Meruru as well as the hilarious character commentary videos that have appeared in past volumes. Each commentary features two characters from the show breaking the fourth wall to give you their personal commentary on each episode.
Oh, and on top of the digital extras, the limited edition release also includes a music CD featuring the ending themes for episodes 12 and 13 and some artwork. If you're willing to pay import prices that is.
Volume 7 can be imported from CDJapan and various other anime import sites now.