They contain the same material as the original softcover editions plus bonus material collected from The Rifter. They are:
Rifts Chaos Earth RPG http://palladium-store.com/1001/product/660HC-Rifts-Chaos-Earth-RPG-Bonus-Hardcover.html
And
Nightbane RPG http://palladium-store.com/1001/product/730HC-Nightbane-RPG-Bonus-Hardcover.html
Alex Marciniszyn