As a big comic fan, (yet disliker of anime/manga), I'd have to say that it's not manga. It's a little bit influenced by it perhaps, but that seems to be the trend in north american comics nowadays anyways.
As for the post on the resemblance to Carlos Barberi's art I'd have to agree, although it is much more CG looking. The GB ones don't seem to have the same freshly inked feel that a lot of the Impulse stuff does. But I'm not complaining, they do look spiff.
p.s: Spidey, I love your avatar.