Reports have started sprouting all over the web about an overnight being called at Apple Stores next week. 9 to 5 Mac posts that Apple has scheduled "overnights" next Wednesday, July 13th, where store layouts are changed and new promotional materials are installed while store management is briefed on new products. Though their source offers no exact information linking the Mac OS X Lion to next week's overnights, it is probable that OS X Lion will be a major focus of the changes. Macrumors also reported that Apple has required all Apple Stores to upgrade the RAM on all display computers by this Sunday hopefully prepping them up for the new OS X install.
Separate reports have said that Apple might offer updates at the Apple Store itself to help new customers with the new OS.