According to GameFront.de the reason why Devil May Cry 4 & Resident Evil 5 weren’t present at E3 is because neither game were in playable form & they won’t be shown again unless they are actually playable.

I’m expecting both games to be present at the Tokyo Game Show (TGS) which takes place September 22-24. If they aren’t present I think my heart will shatter into 1000 pieces….

GameFront.de – DMC4 & Resi 5 E3 Absence Explained