If I had to guess on the general flow, assuming it's a relatively linear adaption of the story-
Checkpoint façade -> Bookstore -> Hotel Grand -> Crashed elevator as a transition -> Basement scene + Bloater -> Urban street with Pittsburgh bridge in the background as a transition (maybe the checkpoint right before?) -> Sewer tunnels, my fav
-> Long suburban street overrun with infected as a finale
I still think those will be the major scenes that we will experience, even if they get a little jumbled. My main question is- do we start right with a scene featuring the infected, or slowly build up to their appearance?