MovieGoods DS poster came in today.
My verdict: Probable original. If it's not, it's a superb repro printed directly from a high-quality digital image with recreated text and logos.
Size: 27 1/16" x 39 7/8"
Front:
Back - definitely lighter/whiter, back seemed to match up with the front when I held it up to the light:
Small text is sharp, but not razor sharp:
Small text on back:
Compared to known Inception SSR digital repro from Tom Loce (bottom), the text is much sharper on the Joker (top). The text on the Inception is obviously granulated and fuzzy. Unlike the Inception repro, the Joker is very unlikely to be a scanned in or photographed digital repro, although it is possible the text and logos were recreated on the source digital image. The WB logo on the Joker appears to be smudged, which is the only defect I've found so far: