I've seen the reviews for the NEX-C3 an they all mention the two lenses available plus the occasional mention of the few other lenses that will be out later, but do we know what other accessories are available for these cameras?
Sony doesn't have a lot of accessories for the NEX cameras. Off hand, I know of a half case/lens case accessory, the optical viewfinder for the 16mm lens, a screen protector, an external flash, and the Alpha lens adapter. There may be a few more, but not many. A company called JTec made some additional accessories for the NEX-5 that included a cold shoe and an L-bracket. Rumor has that Arca-Swiss will be releasing similar accessories in September, but I can't say what cameras they will fit.