Check out this article on the SFX website:
http://www.sfx.co.uk/2014/08/04/dirk-gently-coming-back-to-tv-thanks-to-max-landis-and-idw/#nullDetails are emerging of an IDW and Max Landis co-funded development of a new TV-Series of Dirk Gently. They have secured the world-wide rights for this and there is only sketchy information at the moment.
I hope that this time around they capture more of the essence of the story and keep in some of the more key elements that were sadly left out or only hinted at in the BBC production.
No word on any casting yet but again lets hope for some sympathetic leans to the book.
Worth keeping an eye on.