Canonical releases 13.04LTS (Raring Ringtail) on 25th April 2013. Joey-Elijah Sneddon (of OMG! Ubuntu!) gives a nice summary of what we can expect from the latest release.
I'll try it on the 6400 to see if Canonical has fixed the virtual file system issues and then think about upgrading my desktop and file server. However, there's no urgency, support for 12.04 runs until April 2017.
Sources & References:
- Ubuntu Wiki: Raring Ringtail
- Ubuntu Wiki: Releases
- OMG! Ubuntu!: 10 Best Ubuntu 13.04 Features – From Social Lens to Window Snapping