When Midway fell apart and was bought by Warner for $49m, they took over the rights too many old and new IPs. This Is Vegas "coming soon".
The URLs in question are career-criminal.com, gauntletds.com, gauntletthegame.com, and eclipse-vegas.com. Only the last site is actually active with the This Is Vegas logo present on it with the words "Coming soon..." attached.
An open-world sandbox game, This Is Vegas was originally set to retail in holiday 2008 but was beset with delays. It takes a tongue-in-cheek look at Las Vegas as the player does everything they can to make it as un-family friendly, and full of sin as possible.
When Warner bought Midway Games they didn't say anything about This Is Vegas getting a release, and in fact laid staff off at developer Surreal Software and two other Seattle-based studios now under their payroll. It seems Warner may gamble on it yet...
Check out the old debut clip for This is Vegas below, pegged for Xbox 360 and PS3.