I wish I was back in L.A. I would love to go and see that.
My guess as to the "rare and unseen" clips would be what is on the F For Fake Criterion 2nd disc. If anyone has this, you'll know what I'm talking about. I could be wrong, but on that release they had Orson in his last years living with his, uh "companion" (as it was put), Oja Kodar (a beautiful brunette). After his death, Welles left her many of his incomplete movies on 16mm, 35mm, etc.
The short documentary that she shot is called "One Man Band". It is around 88 minutes and shows clips of Welles unfinished films and short films he made of her, including a very erotic one in a car, which is not dirty, but very sexy in an artistic way.
Watching a clip from The Merchant Of Venice was amazing and Lord, I wish this was released. It was completed, but before Welles could get to editing the film, the negatives were stolen. You just have to wonder.