Forumites across the Atlantic have been reporting that a GTA teaser trailer was shown from 2am to 2.30am EST on the FX channel's infomercial slot.
What's intriguing about the ad is the way it mimicked the holding page you see at the official site and then... well that's it. It did nothing else. According to those who saw it (insomniacs and night shift workers by the sound of it) it displayed the GTA IV logo and a countdown ticked away in the background. At the end of the half hour the usual 'Not Yet Rated' voice was heard and the trailer ended.
Rockstar Games in the UK have confirmed it was an official trailer but couldn't comment on whether a similar ad would appear on British TV. That's not going to stop us skipping through all the late night Sky channels at 3am in the morning just in case it shows up, though.
In the meantime, to get an idea of the experience, head over to the official site and see if you can stick it out for half an hour. And don't forget - to see the real trailer you'll need to be sat at your computer at 11pm UK time next Thursday. Cancel everything and be there. You know it'll be worth the wait.