Tulipthedog.com - official site
The official site was recently launched with movie clips, stills and documentary clips.
http://www.tulipthedog.com
The site includes this statement about the expected release date.
"My Dog Tulip tentatively has a completion date of July 31, 2008. It will be the intent of the producers to premiere the film in competition at the Cannes Film Festival in mid-May, 2009, following with the theatrical release in London, the scene of Ackerley’s real life years with his dog, Tulip."