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As far as we know, he's not scheduled to appear in any episodes of series 6.

It's unknown whether he will appear in a future series. Both Moffat (who writes Doctor Who) and Davies (who writes Torchwood) have said it's not impossible, but neither of them, nor anyone else, have revealed any plans.

Moffat and John Barrowman (who plays Captain Jack) revealed that they were in discussions to have Jack be part of the Doctor's army in "A Good Man Goes to War", but were unable to make the scheduling work.