This evening the final trailer for GTA IV will be released. It is named "Good lord, what are you doing?" AKA "Everyone's a rat" ; it will be 1:15 minutes long and has a filesize of 78MB. These facts were reported by cynamite.de - they have the HD-Version already on their disc. But they do not have the correct password yet.
The trailer will come out about 11 pm MET.