Here is a little bit more info from the Dark Horizons website about it as well:
"DreamWorks Studios has announced the official start of production on Tim Burton's "Sweeney Todd" and will partner with Warner Bros. Pictures on producing, finance and distribution.
Official word from the studio Wednesday confirmed Johnny Depp's involvement along with additional details on the movie version of the award-winning Stephen Sondheim musical thriller about a murderous barber wrongfully imprisoned who later seeks revenge on the judge who sent him up the river.
The project is scheduled to go before cameras in London at Pinewood Studios on February 5th with an anticipated late 2007 release. Rehearsals and pre-recordings will begin in November and December.
Oscar-winning costume designer Colleen Atwood ("Memoirs of a Geisha") and Oscar-nominated cinematographer Dante Spinotti ("L.A. Confidential") will head up their respective departments, John Logan has penned the script."