The wingspan is a mere 25 cm. Although the only known specimen is not a fully grown adult, it would not have gotten too much larger had it lived that long. Smaller pterosaur specimens are known, but they represent less mature individuals (i.e., hatchlings).
As I mentioned, pterosaurs are commonly known as "pterodactyls" outside of the paleontological community. "Ptero-dactyle" is an old term for Pterodactylus, a genus of pterosaur known from the Solnhofen deposits in Germany. That term and other terms like "ornithosaurs" have not been in use in paleontology for a very long time. There is, however, a large group of short-tailed pterosaurs called pterodactyloids; Nemicolopterus is not really a "pterodactyl", but it is a pterodactyloid.
A far more egregious mistake is being committed by many places reporting this creature, though: calling it a dinosaur. Pterosaurs are not dinosaurs, but are generally considered dinosaur cousins. Most scientists consider them non-dinosaurian stem-avians, although the possibility of a stem-archosaurian position has also been investigated. Unfortunately, primitive pterosauromorphs are not known (with the possible exception of Sharovipteryx mirabilis, a poorly-known Triassic animal seemingly having "leg-wings"), so it is difficult to pin down their exact relationships. But it is quite certain that they were not dinosaurs, that is, there is no way that they were descended from the final common ancestor of Iguanodon bernissartensis and Megalosaurus bucklandii.
All these nomenclatural goof-ups aside, it's a pretty cool animal, and not just for its size. The toes are curved more than in any other pterosaur, and the authors interpret this as an adaptation to arboreality. I can just picture it hanging like a bat from a Mesozoic tree limb.
What's interesting here is that it has arboreal adaptations, but it's not a primitive pterosaur. This same evolutionary pattern is seen in birds (avialans): the earliest members lack arboreal specializations, but some later members developer them. But this pattern is not, so far as we know, seen in bat (chiropteran) evolution. The earliest known stem-bats have arboreal adaptations, while the earliest pterosaurs and avialans do not. Might this reflect a fundamental difference in body plan between pan-mammals (including apo-chiropterans) and sauropsids (including pterosaurs and avialans)?
Wang, X., A. W. A. Kellner, Z. Zhou, and D. A. Campos. (2008 February 12). Discovery of a rare arboreal forest-dwelling flying reptile (Pterosauria, Pterodactyloidea) from China. Proceedings of the National Academy of Sciences 106(6):1983–1987. doi:10.1073/pnas.0707728105