No, there is no version for Outlook 2013. I have checked the official website, and these are the supported versions:
- Outlook 2007 on Windows XP
- Outlook 2010 on Windows XP
- Outlook 2007 on Windows 7 (including 64-bit)
- Outlook 2010 on Windows 7 (including 64-bit)
Official website: http://calendar.comcast.net/calendar/outlook
If the plugin is still maintained, you should expect a release in the near future.