If you haven't been following the game's development, Resonance is an adventure title forged in the classic style- in every sense of the term. You won't find any 3D here, nor is there a trace of the action/adventure gameplay found in many of Telltale's reinventions of the genre. What you will find, is a serious case of nostalgia (in a good way) and a hardcore, sic-fi, point-n-click tale.
Resonance is available now through the official website, and GoG.com There's also a Steam release in the works for over the Summer, but if you don't feel like waiting for that (and you just gots to have some tasty DRM), you can pick up the game through the official site and be one step ahead of the curve. Buy it there and Wadjet Eye will send you a voucher for the Steam-ed edition (as soon as it's available) for nuttin'.