How can I secure a Retina MacBook Pro to a desk? (similar to how the older MacBook Pro could use a Kensington Lock)
I know SE is not a place for product recommendations, but this Henge Dock sounds like something that might be useful to you.

The dock hugs the MacBook Pro from both sides (inserting a plug into all the available ports), and has a Kensington lock port on the back.

I do not own this product but I have been considering it.