A 4.1.1 Reviewer app went live on the App Store today, which includes a fix to the iOS 5.1.1 bug mentioned below.
We have identified a bug that prevents 4.4.0 apps from working on devices running iOS 5.1.1 (mainly iPad 1). We have submitted a new Reviewer version to Apple and have requested an expedited review. For those users that have already updated to the 4.4.0 Reviewer app on iPad 1, you can use temporarily use the iOS Simulator to review your work until the update is approved and live.
Any users that generated new 4.4.0 app builds today should generate a new before submitting their app update to Apple.