It is confirmed that the PC version of Havoc with 4 new maps and Zombies release has been delayed until 3rd March 2015.
Sledgehammer Games have posted the following statement on their Facebook group:
“UPDATE: We have encountered an unexpected issue with the PC release for Call of Duty: #AdvancedWarfare‘s first DLC content pack, “Havoc,” and we’re holding its release until March 3rd. We don’t take this decision lightly, but rest assured that our team is working with Activision to get this content to the PC community as quickly as possible. In the meantime, we’re turning on #DoubleXP for all PC players to enjoy.”1 of 1