A clue to a new Rhino feature

Last week I posted a newbie texturing question on the Brazil newsgroup and got this reply from Andy le Bihan

Yes - you can use the box mapping/divided texture space options to map a cube map to an object, if you have a reason for doing that...However, the cube map texture was added to the RDK for another use - one that is currently "under-wraps". Hopefully it will become apparent fairly soon.

I'm sure to someone who knows more about this stuff it's obvious what he's talking about. Not to me though.