Oh darn. I was really hoping it was some new final episode and not a rerun of the old final episode, which appears to be the case.
It sounded like it was a new one since OP mentioned "I've seen it". So have most of us, since it's been around since September. I thought it was a pretty decent finale as far as finales go, but I thought they came up with one last final effort.
Looking forward to seeing the behind the scenes, though.