On September 18th, Warner will release three sets (or six if you want to look at it like that

) sets called "Best of HD DVD" or "Best of Blu-ray" respectively. Each contains four releases that are already out separately, so it may not be interesting for all of us early adopters. Howver, it could be interesting if a set just contains four movies you wanted but didn't acquire yet.
The price seems to be around $60, at Amazon they go for just under $59 (some people may still be eligible for the extra 10% discount).
Here's the contents of the sets:
Best of HD DVD (BD) 1:
Lethal Weapon
The Road Warrior
Swordfish
Training Day
Best of HD DVD (BD) 2:
The Last Samurai
Phantom of the Opera
Troy
Unforgiven
Best of HD DVD (BD) 3:
Blazing Saddles
The Departed
Goodfellas
Superman the Movie
Cees