This change brought two minor changes: 1) The menu shown by clicking the clock now has an option to "Open date and time options...", and 2) a Timezone selector in the options menu. Clicking the Timezone selector offers shows the many timezone options.
Some other changes: I don't know if it was this way before, but popup windows seem to open in new tabs instead of separate GtkWindows.
Download revision 29376: Extract the chromium-os-rxxxxx.tgz archive and run chromium-os. To get the many translations, extract chromium-os-i18n-rxxxxx.tgz and move the files to the locales/ folder. To get the HTML element inspector, extract chromium-os-inspector-rxxxxx.tgz and move the inspector/ folder to the resources/ folder (create it if necessary).