Бета версия.
Release notes:

Support for the new AVR ONE! on-chip debugging and programming tool. It currently supports all AVR XMEGA family devices on both JTAG or PDI 2-wire interfaces, as well as debugging with Nexus AUX trace on all AVR®32 32-bit micro-controllers and processors (Use AVR32 Studio for AVR32 micro-controllers and processors).
Support for ATmega32HVB, ATxmega256A3B, ATxmega256A3, ATxmega128A3, ATxmega64A3, ATmega32U6, ATmega88PA, ATmega168PA and ATmega324PA
Introducing Live debug that enables you to attach/detach to running processes. AVR ONE! feature only.
AVR Battery Studio v1.0. Front-end to the SB200/201 Single and dual cell Smart Battery kit.

Это к скорому выходу в серийное производство линейки xmega A3

Качаем тут: http://www.atmel.no/beta_ware/