We're not certain why anyone treats the inevitable arrival of a second-gen iPhone sometime next year as earth-shattering news, but Goldman Sachs released a note to clients yesterday saying that the rumored 3G version is in its "final design phase." The investment firm's David Bailey says he got the info from the usual assortment of moderately-reliable Asian component suppliers, and that he expects the new model to have "similar form factor" with a "different look." Rounding out his list of obvious predictions, Bailey also said the existing model will get a capacity bump sometime next year as well, which makes sense given the proliferation of 32GB flash devices we've seen pop up lately. Somewhat more interestingly, Bailey also said that Apple is planning on retooling the Apple TV next year, and that his sources the new version may pack an LCD screen. Sadly, Bailey didn't have much to say about that rumored subnotebook, only that he's heard of possible "design issues." That doesn't sound too promising -- but we're certain Steve will fill us in next month.