Just been giving NOOBS Lite 2.7.0 a go on my old Pi 2. Normally go straight to Raspbian but thought I'd give a few other OSs a try.
After installing via NOOBS, RISCOS won't boot- after starting it via the NOOBS OS selection screen I just get a blank screen and no activity on the LEDs.
It looks like the distro NOOBS Lite 2.7.0 is downloading is pretty old: http://downloads.raspberrypi.org/riscos_1760/RISC_OS.xz 2015-02-17
( Yes, I imagine downloading an image direct and installing it would probably work, but if it's actually a bug I'd like to do my bit and report it to the appropriate place given NOOBS is supposed to be for newbies and ought to just-work™ )