I've tried UIKit 3 out before, just not with Beans. Its integration into Beans has been discussed before - the verdict seemed to be that we're awaiting a stable UIKit 3 release.
One concern I have is being able to enqueue and dequeue components. UIKit 3 doesn't seem to allow you to pick and choose components like UIKit 2 does. (Could be wrong about this...)
Thanks for that. It looks like the recomended approch currently is to enqueue UIK-3 .less files as well as UIK-2. Not ideal but this is just an experimental sandbox site. UIK3 definitely has a nifty pack of tricks I'm keen to trial.
There is a package of .less components BTW. https://github.com/uikit/uikit/tree/develop/src
Thanks for the link! How'd I miss that one...