Wizard Entertainment did an interview with David Yates a little over a month ago where he discussed filming Harry Potter 6 and the possibility of Rufus Scrimgeour not being in  it.

The only problem is, we’re looking at the next adaptation and Rufus Scrimgeour, who takes over the Ministry of Magic from Fudge, we’re not sure if he’s going to be in the finished screenplay yet. We’re struggling with it at the moment, and he’s in one moment and he’s out the next. But if he stays in, I’m going to be on the phone quick as a shot to Bill and say, “Bill, come on, you’ve got to do this, man.”

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Thanks Veritaserum!