The Chromecast is getting a new update to build 13300. It is described primarily as a "maintenance update" and doesn't really add any new features. Here's a quote with the details,
Source: Google Chrome Releases Blog via GoogleTVForum.orgThe Chromecast device has been updated to build 13300. This update will be rolled out over the next week, and you should receive the update automatically. The update is largely a maintenance release, and contains the following changes:
- Kernel update
- Security fixes
- Robustness improvements
- Security enhancements
More information about the Chromecast device is available on the Chromecast site.