According to a recently-posted job listing, Microsoft is looking to port its Xbox LIVE gaming portal to iOS and other platforms. Although iOS recently received a native Xbox LIVE app, the gameplay portion has remained a WP7-only feature.
The Redmond company has been extremely active in the App Store over the last few months, releasing the aforementioned LIVE app, the popular Kinectimals game, and a SkyDrive client. And it doesn't look like it's slowing down any time soon...