Yeah, as Spooky said, just shy of 6GB, we slimmed it down by removing Crysis Wars intro videos, maps etc. (so no CW multiplayer) and then used some rather extreme compression
The reason we didn't bundle the 64bit binaries is we are trying to keep this above board - i.e. the trial is free and does not come with 64-bit, we'd have to extract them from a purchased version of the game.
As for redistributables, the fanatastic MWLL launcher handles that on first run.