Aha! My first deviation. This is in conjunction with the upcoming The Passing Campaign. Been a big fan of L4D games, I'm damn excited. Photoshopped for 2 hours during my break at work. All sources are from the net. All characters belongs to Valve.
Or Make 8 Survivors In Any Campaign As An Add-On? I Seen Loads On Youtube That Got Bill Working. Now That They Had The Sacrafice Out, Maybe Now It's More Easy For Them To Edit Bill, To Call Out The L4D2 Infected.
I'd Say Make The 8 Survivors Thing As An Add-On, And Not A Modifieing Kit.
It's a shame we couldn't play as the originals, but my mate Dogmeat (who always played a Bill, and even dressed as him for his birthday last year) pointed out it would require a lot of work generating the models and dialogue combinations for all the possible groupings.