Apparently the Raspberry Pi 3 can boot from things other than the SD Card, including USB flash drives. I got my Pi 3 today (hurray!) and burnt the latest Raspbian to both an SD card and a USB flash drive.
The Pi boots from the SD Card no worries (of course!), but it doesn't do anything if I just plug in the USB Stick (and I removed the SD card).
Do you still need the SD card to 'pre-boot' still, or do you have to format the USB Stick in a certain way? Anybody have a setup like this working?
See : "USB and PXE network boot" at https://www.raspberrypi.org/magpi/pi-3-interview/
It would be nice to be able to swap in a test operating system like Windows 10 iOT or Ubuntu on a Flash Drive, rather than an SD card sometimes!