Anime News Network reports:
The official website for the anime Yosuga no Sora confirmed this week that the Blu-ray release will have a different episode order from the DVD release, but it also revealed that some episodes will be included on more than one Blu-ray volume.
The first Blu-ray volume will contain the first four broadcasted episodes. However, it will have two versions of episode 2 — the “BGM (background music) Kazuha Migiwa Ver.” and the “O.A (On Air) Ver.”
The second Blu-ray volume will contain the first, second, fifth, and sixth broadcasted episodes. However, it will have two versions of episode 2 — the “BGM Akira Amatsume Ver.” and the “O.A Ver.”
The third Blu-ray volume will contain the first broadcasted episode and “three other episodes.” The limited and standard editions of the fourth Blu-ray volume will each contain the first broadcasted episode and four other episodes.
The four DVD volumes will each contain three episodes in broadcast order, for a total of 12 episodes.
So the information from Animesuki forums was true after all.
Well, I certainly wouldn’t mind it being done this way. If say I only liked Sora’s arc, I could just grab the last BD volume and not worry about having missing episodes. Besides, it’s just stupid to sell a Blu-Ray containing only two episodes *coughAmagamicough*