The Lion just purred.
Apple pushed out an update to the Developer Preview of the next Mac operating system today. Mac OS X 10.7 Lion Developer Preview Update 1 is available via Software Update and is the first update since the Developer Preview first came out on February 24, 2011.
The update is minuscule -- 2.2 MB -- and according to the update notes "This update is required to redeem downloads of Mac OS X Lion seed builds
