"Dark Shadows", which are due for release May 11, 2012.
As for the news about Naomi Collins, that doesn't surprise me, as I expect that part of the 18th century won't take up more than 5 minutes of the actual film.
We have to be careful not to confuse speculation with fact. We have very few facts about this movie and far more speculation.
the filmmakers are entitled to create an "atmosphere" for their story and for whatever reason burton and his team have chosen 1972 as their canvas. perhaps it means something plotwise or perhaps it's just a stylistic decision. we won't know until we see it.
Not sure about only 5 minutes, but it will most probably only last so long as necessary to setup Barnabas' backstory with his arrival in America as played by Thomas McDonell, with focus then shifting to Depp taking over as Barn and his relationships with Josette and Angelique, his betrayal of Ang (at least in her mind), and his cursing and burial.