Apple has sent out an email to developers soliciting them to get their Lion-ready apps into the Mac App Store so they can be ready for customers alongside the launch of Lion later this month. From the email:
OS X Lion, the eighth major release of the world's most advanced operating system, will soon be available to millions of Mac users around the world. Submit your Lion apps for review now so they can be on the Mac App Store when Lion ships this month.
Apple also asks that developers be sure to build, test, and compile their apps using the latest developer release of Lion and Xcode 4.1. As MacRumors notes, this call for submissions would be cutting it close if Apple is to release Lion this week, as most Mac App Store submission take about a week. However, Apple has been known to speed up new release submissions for apps in the past.