"This release builds upon the work done for the 2.5 series, and delivers many new drivers for internal MCU peripherals, USB support, Atmel SAM3N support, and a new API for block devices. New supported CPU: Atmel SAM3N Cortex-M3. Atmel ATmega1280 and Arduino Mega code. New module: USB support for STM32. New drivers: usb-serial, USB keyboard, and USB mouse. A new interface for block devices: KBlock. A new module: generic event completion infrastructure. A new and more flexible I2C API."