Is it a copy of this one?
If so, you has good knowledge of GIMP sites :D
Oh, and JDH, I made it myself.
Hmm, good question.
They most probably have noticed many people enjoyed Nazi Zombies so perhaps they may make a more modern version of that?
However so far these are the new features/updates I can think of:
Better Gameplay (eg new perks etc)?
New Campaign (Obvious)
This seems VERY similiar to Half-Life 2, except the people have become zombies meaninglessly, whereas on Half-Life 2 they get "humped" by Alien Crabs. Even one or 2 of the zombies died the same way.
Still looks good though.