AVR Studio 4.13 SP2 BETA supports the new STK600 kit from Atmel.
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Release Notes

Что нового:
* Part support
The following new parts have been added to AVR Studio:
- ATmega32HVB, ATmega1284P, ATtiny48, ATtiny43U

Check the device support matrix in the help to see which devices are supported by which tools.

* New Features
- Full support for the new STK600 starter kit, including programming front-end and command line
tools.
- New devices in Simulator V2: ATmega164P, ATmega324P, ATmega644P, ATmega1284P, ATmega48P,
ATmega88P, ATmega168P, ATmega328P and ATtiny43U.
- Several enhancements in the IO view.
* 16 БагФиксов относительно SP1 (читай Release Notes!).