It was slated to ship with WinMo 6.1. That's what we saw at CTIA a few weeks ago. I've heard whispers that they changed their mind and decided to upgrade it to 6.5. It has very extensive Samsung customizations to the UI. Not just TouchWiz on the home screen, and not just what the Omnia I had, but even more.. I imagine that integrating all of that custom stuff into 6.5 would take quite some time.