Add one more deleted scene to The Avengers 2 with the Wakanda Vibranium Mines.
Concept art has hit the net revealing images of the design of the mines (via gregoryfangeaux.com).
More than likely this scene involved Andy Serkis' Ulysses Klaw as well as Ultron upgrading himself, which we never got to see.
It also would have been interesting to know whether T'Challa or his father was a part of the scene, as Black Panther will be featured in Captain America: Civil War next May.
Update: Hit the link above for pics.