Sadly, Pebble won't be making its way to backers by its original September estimate, but the design team wants you to know that it's hard at work, traveling the world to source components, running shipping tests and spending time refining the user interface in order to provide a top-notch experience once you do receive your device in the mail. To that end, Martijn, the UI designer, has dropped by Vimeo to provide us with a "sneak peek" at the device's operation, including some demos on iOS and a connected prototyping board, using a custom tool that sends designs to the Pebble screen from any graphics program in real-time (a feature that will reportedly also be available in the SDK). From what we've seen, there appears to be plenty of space on the screen to show incoming calls, read emails with eight lines of text at a time, view appointment details, select songs and control volume, and, of course, see the current time. Commenters seem to be quite pleased with the design so far, and we have to agree -- it's a pretty slick UI. Jump past the break to see it in action.