We've been waiting for the first sign of the web-based Windows Live services to show the new Live UI for sometime now. Although the following screenshots don't show the Windows Live Orb, they do show the new Vapor header as well as showing how the Live.com team has started to improve their first-run experience.
Edit: Looks like it should be rolled out later today.
Edit 2 by Sidebar Geek: Due to some issues, the Live.com Team says the update to Live.com will happen sometime early next week instead of this evening. Screenshots (click to enlarge):