The timing is incredibly suspect and is another kick in the head to the Zero Dark Thirty team. If I were them I would be fuming since Feinstein's put down of the film basically scuttled its chances in the awards race. Who knows what the race would have been like had the film not been completely tainted.
Here's what Senator Dianne Feinstein said in her statement:
In December, Senators Levin, McCain and I wrote to Acting CIA Director Michael Morell seeking information provided to the filmmakers of 'Zero Dark Thirty' by the CIA. The CIA responded with information about its interaction with the filmmakers. I see no need to request further information. In a separate letter, Senators Levin, McCain and I requested the basis for CIA's view that enhanced interrogation techniques provided some intelligence that led to the killing of Osama bin Laden. The CIA's response to that letter is forthcoming.
Finally, Senators Levin, McCain and I wrote to Sony Pictures in December and outlined our view that scenes in the film which credit CIA's interrogation techniques with leading directly to the takedown of bin Laden were inaccurate and misleading. The committee has not made any contact with the filmmakers, did not request documents from any individual associated with the film, and have not conducted any investigation into the film whatsoever. We have simply asked questions of the intelligence community pertinent to our oversight responsibilities.
Senate drops Zero Dark Thirty inquiry (The Guardian)
Senate Drops 'Zero Dark Thirty' Probe (The Hollywood Reporter)