I doubt if we will ever get an audio commentary for The Fifth Element from Besson, Oldman or Willis; and it is very unlikely that Tucker or Holm will record one either. The only person who I think would be up for a commentary would be Jovovich, as the others rarely contribute to DVD extras - especially Besson who is totally against them.
We have the full extra feature listing now for The Fifth Element:
Extra features include such featurettes (totalling 120mins) as The Alien Element, The Digital Element, The Visual Element, The Star Element, and The Fashion Element; also included are features about The Diva; Camera, Costume and Set tests; and a feature-length fact track.
Full aritcle here.