Developers are going to be treated to a host of must-have services out of the gate, including accelerometer support, location-based APIs using Microsoft's own Location Service, a newly-announced Microsoft Notification Service for pushing notifications regardless of whether an app is running (sound familiar?), hardware-accelerated video with integrated DRM and support for Microsoft's Smooth Streaming tech, multitouch, and camera / microphone access.
On a related note, Microsoft has shared some important details on the revised Windows Phone Marketplace (notice the subtle name change) for WP7S-based devices today. The revenue split remains unchanged -- 70 percent goes to the publisher, 30 percent to Microsoft -- but the developer portal for managing submissions has been "streamlined" and some of the incremental costs associated with it have been killed off; what's more, students enrolled in the DreamSpark submission will have their registration fees waived altogether. The Marketplace has evolved from an app store to a content "destination," housing apps, casual and premium Xbox Live games, music, and customized carrier stuff in one spot. We'll be wandering MIX10 throughout the day, so stay tuned as we get more of the story.