The Wheelman and WWE demos are currently restricted to Gold members only, while everyone can grab the Wanted demo. And hey, all three games are coming March 24.
Don't be surprised if PlayStation 3 demos for these three pop up later today, either. The Wanted demo is already confirmed, and the other two are rather likely candidates too.
Update: Wheelman co-publisher Ubisoft says the demo will hit PS3 on March 12.