I commend to you all "Dambusters" by Max Arthur, forword by Stephen Fry. Totally awesome account of this historic feat of arms.
As good as the original is, a remake is way overdue. This was a "larger than life" act (60 feet in a lanc, at night, or in daytime with the windows covered in blue cling film...**** that!!) that needs to be seen again with all the technology the film industry now has. The main players behind the film seem to have the right attitude to history and therefore the "truth" seems to be in good hands.
I don't know the scope of the new film, but one thing that is totally missing from the original is the view from the ground...both horrendous (many of the casualties were Ukranian women captives) and remarkable (read the book's chapter on the gun placements on the Mohne).
I hope the remake takes a broader view, is well directed, well cast and historically accurate. If so, it will be an epic.