This is the first direct sequel in the 30 Days pantheon and the fourth film to be released (only the first having a cinema release).
Don't be put off by the direct to Blu Ray tag, these films are excellent and this trailer looks to up the ante as Stella and some other survivors from Barrow decide to hunt and kill the remains of the vampire Clan who slaughtered their town.
30 Days was a huge breath of fresh air for me as only Blade had really held together the vampire myth properly. The current Twilight/Vampire Diaries lore is stripping away the frightening element from these creatures.