Exactly my sentiments. The first material that came to my mind outside of plastics, was, indeed, ceramics, which we all know has been successfully "intersticed" with liquidmetal in the bezel of Omega watches.
Of course, I don't see any such bonding in this video of the alleged ceramic case with the guts, but, what do I know?
Not much, except that we are getting the samo samo HYPER PUMP which always presage the Apple Events.