Now this is because the full release date of the game for PC has also been delayed, and the game isn't simply a port of the console version. (destinynewshub.com)
There has been no official announcement on the exact release date of the game yet but it is expected to release in the fourth quarter of 2016. (fraghero.com)
The servers won't be going up until the official release date of the game on February 2nd 2010. (justpushstart.com)