Ubuntu 12.04 LTS Beta 1 was announced on the mailing list by Canonical's Kate Stewart. Among the work for Ubuntu 12.04 LTS is improved ARMv7 hard-float support, Intel RC6 power-savings is now enabled, various package updates, and many other changed items. Xubuntu, Kubuntu, Edubuntu, Lubuntu, and Ubuntu Studio all reached 12.04 Beta 1 status today too.
Among some of the Ubuntu-oriented work for this latest test release is the initial Heads-Up Display(Ubuntu's HUD), Unity improvements, enhanced support for ClickPad devices, the default music player is back to using GNOME's Rhythmbox, LibreOffice is running against the latest version 3.5 beta, and the Ubuntu Software Center has seen some work too.
Some of the non-standard Ubuntu desktop work includes improvements to OpenStack for Ubuntu Server, ARM hard-float support for Ubuntu Core, Telepathy-KDE for Kubuntu, the Calligra office suite is now available, and much more.
Find more details about Ubuntu 12.04 LTS Beta 1 from the Ubuntu testing page.