This is the first build that includes includes support for the x64 version of Internet Explorer. If you're using a 64-bit windows it's available on https://lastpass.com/download.php and will allow both the 32 bit (default IE) and 64-bit IE to work.
We've started work on Fennec, Mozilla's new mobile browser -- looks like it could become a powerful addon since it has full support for addons built-in.
The Google Chrome addon is improving and is now up near the URL bar at the top right in a style that's closer to the default compact toolbar on Firefox. We're testing some new UI concepts here like displaying a colored icon that spins to indicate a possible action, we'd like to hear if you like it better (or not). The extension bar is disappearing from Chrome so it was a good time to try this. Also it looks like Linux Chrome is being worked on so hopefully OS X chrome won't be too far behind.
Safari and Chrome support for Sesame and Yubikey have been added. We're also planning a free multi-factor solution (paper based) as we want everyone to be able to use multi-factor authentication even if you can't spare $1/month.
We've added a number of new password managers that LastPass can import from include Clipperz, PINs and SplashID (on top of the dozen we already support, including Google Chrome import from the installer which was just added). As always if you can get a non-binary export for your legacy password manager, send us the format and we'll build an importer.
Release notes: https://lastpass.com/upgrade.php