At the Q3 2011 earnings call, Apple confirmed OS X Lion is coming tomorrow on the Mac App Store. As noted by MacRumors, a few minutes before the call started Apple pushed an update for Migration Assistant to Snow Leopard users, fixing an issue that prevented the correct transfer of personal data and apps from a Snow Leopard computer to a Mac running Lion.
This update addresses an issue with the Migration Assistant application in Mac OS X Snow Leopard that prevents transfer of your personal data, settings, and compatible applications from a Mac running Mac OS X Snow Leopard to a new Mac running Mac OS X Lion.
The lightweight update can be downloaded now on Snow Leopard from Software Update, or directly from Apple’s website.