Kate Stewart, the Ubuntu release manager at Canonical, just issued the email release announcement.
Ubuntu 11.10 features major improvements to the Ubuntu Unity desktop interface, cloud computing and other server improvements, greatly enhanced ARM architecture support, GNOME 3 desktop support from the repository, Deja Dup back-up support, and further integration with the Ubuntu One cloud storage service. Some of the key packages include the Linux 3.0 kernel, Mesa 7.11, GCC 4.6, and the GNOME 3.2 collection.
There's also many other new features in Ubuntu 11.10, but if you're a faithful Phoronix reader, you've already seen all the Ubuntu 11.10 articles. There's already been many Ubuntu 11.10 benchmarks, plus more tests are on the way. Ubuntu 11.10 doesn't correct any major power regressions compared to Ubuntu 11.04 (aside from enabling the Energy Performance Bias due to an upstream change, but ASPM is still screwed). The boot speed has also slowed down with Oneiric.
There's also more Ubuntu 11.10 details in two Canonical press releases: Transforming the home PC with Ubuntu 11.10 and From client to cloud, Ubuntu 11.10 sets the pace for business IT.
Now it's time to start looking forward to Ubuntu 12.04 LTS, which is codenamed the Precise Pangolin and will be here in April. The Ubuntu Developer Summit for this next Ubuntu Long-Term Support release will take place later this month in Orlando, Florida. See you there.