From what I've heard, there's a reason people have heard conflicting things. Apparently they did some re-editing so that the final episode itself won't end on a cliffhanger after all, but that the big storylines that have been running (assumably things like Chuck's father, Emerson's daughter, and so on,) will all be left dangling.
I've also read Bryan Fuller say that he'd like to wrap those danglers up in a comic while pursuing a movie, so that this theoretical movie could be a fresh start attempt to gather in new viewers, rather than being bogged down in past continuity.
Haven't heard even a WISH for a movie in the last couple of interviews, though, so he may have given up on that idea.