Well, finally got to touch one & test out somewhat @ Att store, Brownwood, Tx. today. Still none on hand, so preordered, should b shipped out tomm. Their definitely rounder than SII/Skyrocket & only about a 1/4" longer. The Super Amoloed HD screen is definitely darker, not as bright as Skyrocket. Seems very smooth & fast, with killer resolution.
Also very expandable, 1st unit with up to 64gb SD card capability. The Qualcomm S4 is much, much faster than S3, even though there both 1.5ghz. The A15 n SIII has a lot more sophisticated architecture than the A9 n SII/Skyrocket, + 2gigs of ram in lieu of 1. Plus a slew of extra killer features, not availably on any other phone, can't wait. Wanted to hold out for Red, but couldn't wait.