Glad I'll be getting this Saturday. And definitely happy about the Juggernaut. I was pulling out all my Khorne models needing built (and generic Chaos Marine stuff I could use, like a couple of old Dreadnoughts), and I had a Lord on Jug in the mix. It'll be cool to be able to use him. (Granted, you can do it with Codex: CSM, too.)
If he can join a unit of Bloodcrushers, even better!
Nice to have confirmation on the Instability. White Dwarf seemed to hint at that, wasn't sure if it was a mistake or not.