The Grave Guard look nice, but not amazing enough imo for me to replace my current 20 or so with the new models. If something changes with them in the new book, where you could even field two units of them, then yeah, I'd grab some of the new ones, but otherwise I'll stick with what I have.
I'll be picking up one of those Varghulfs however, thank you very much! Especially so I can go to one of my mates, 'Hey Rad, you know how you love to use that damn Gorger to come up behind my lines and rear charge the unit with my general in it?? I'd like you to meet my new Varghulf...' :grin:
Have to say it will take a little bit of getting used to fielding both old and new models/mini's as part of the one army.. I came to warhammer during 6th Ed, and have always played VC Lahmians, so this will be my first experience of getting new models, and working out which ones to add to my current army and which ones to resist.