According to Web Sunday, the releases of Black Lagoon: Roberta's Blood Trail
Blu-ray and DVD volumes 3 - 5 were announced to be delayed for two months on account of the production status.
Previous dates -> New release dates
Volume 3: November 3rd -> January 7th 2011
Volume 4: December 22nd -> March 2nd 2011
Volume 5: March 2nd -> May 11th 2011
Source: Web Sunday