I want to know why dishonored was delayed a few times.

When was it delayed?

First the official release date was "2012" and then it was announced to be "http://www.bethblog.com/2012/05/10/dishonored-arrives-october-9th/" back in May, which haven't changed.

If you seen any other date some place else than http://www.bethblog.com or the http://www.dishonored.com/, chances are it's been fake.