So, we've been working hard on Moonstone and Spotlight for the last year as part of LG, and we're really happy to be bringing all this work to the public.
The GitHub repos are https://github.com/enyojs/moonstone
, and we've already incorporated them into the 2.4 preview sampler at https://github.com/enyojs/moonstone
. If you view the Moonstone UI samples, you'll see that you can use the arrow keys to navigate around the controls.
Spotlight support for Onyx shouldn't be too hard, but we'll have to add some enabling code there.