Bandai Visual announced that they canceled the release of "Kurokami" Blu-ray Disc normal editions for all the eight volumes owing to the various circumstances. The limited edition of Blu-ray and the normal edition of DVD will be released as scheduled.

The Amazon DVD/Blu-ray Ranking
Kurokami Blu-ray vol.1 Limited Edition: 2,937th
Kurokami Blu-ray vol.1 Normal Edition: 94,482nd
Kurokami DVD vol.1 Normal Edition: 14,650th

Ref.
Macross Frontier Blu-ray vol.8: 24th
Code Geass R2 Blu-ray vol.8: 50th

Source: Kurokami official website
Source: Amazon Japan

The Blu-ray Disc of "Viper's Creed" had once been announced to be released but it was also canceled. A single edition of DVD will be released for this title.

Source: AV Watch
Source: Neowing