This new release candidate contains fixes for a few locales, no further code changes. Since the Thunderbird 3.1 release is scheduled for this week, I assume this will be the final release candidate.
Candidate builds for Lightning 1.0 beta2 in 33 languages are available as of now for:
A corresponding build of the Provider for Google Calendar is also available at those locations and will be uploaded to addons.mozilla.org once the release cycle completes.
Please tell us what you think of these candidate builds and file bugs in Bugzilla as you go. The release is near, and we are glad we can finally concentrate on the next one!