Canonical has released the official logo of the upcoming version of Ubuntu operating system, Ubuntu 13.04 codenamed Raring Ringtail. Further, in devel mialing list, the developers announced that Raring Ringtail is now open for development and so programmers can gear up for the next release:

Raring is now open for development, with syncs from unstable currently running.

The development version starts with updated versions of eglibc and python3, and some upload rearrangements.

Raring Ringtail will ship with GCC 4.7 and python3. Some of the major enhancement in this release will be improving the performance on mobile devices such as laptops, tablets and netbooks. A better battery life with optimized kernel and environment is being planned. 

For nerds, some of the important updates:

• GCC 4.7 did see some updates from the upstream branches, and supports x32 multilibs on amd64 and i386.
• Python 3.3 is now the default python3 version. Packages are now rebuilt to use the new python version. It's the plan to drop python3.2 support before the first raring beta release.
• Toolchain source packages are now setup to support an aarch64 cross toolchain.
• For Raring, all uploads will go to raring-proposed, and a modified instance of "britney" (the software that handles migration from Debian unstable to testing) will copy them to raring when they've been built everywhere and do not reduce the count of installable packages in the archive