Another new Arduino which features Atmel's ATSAM3X8E with ARM Cortex-M3. It'll be launched at October 22. No floating point unlike the ARM Cortex-M4, but hey, it's still much easier to do something heavy with a 32-bit.
http://arduino.cc/forum/index.php?topic=125067.0
That Atmel ATSAM3X8E has a lot of guts inside, which is the hardware memory controller (not enough RAM? add some on it!), DAC (for all our projects which are musical in nature), SD-Card interface (no more need to write tough libraries for that anymore) and others like DMA.
I hope the IDE contains all the example libraries which utilizes the stuff inside.