Got a notification on my dashboard that updates are available for TwentyTwelve and TwentyEleven themes. The Appearance>Themes page link that says "view version 1.6 details" doesn't actually provide a listing of the differences, just brings up a window with http://wordpress.org/themes/twentyeleven. A forum member summarized them for TwentyTwelve in http://wordpress.org/support/topic/twenty-twelve-12-release-notes. I can't figure out how to get the info from the Trac interface.
1. Can someone help and provide the TwentyEleven differences?
2. Why don't themes have a Changelog like plugins do?