I made a post here about looking at the US Patent and Trademark website to see what GSN has registered in the past. I didn't find much, but I have dug up some stuff this time.
Apparently, one slogan GSN has registered for their promotion is "The Network for Games". That's kind of funny considering their future former name...
They've also registered a name called "Gimme Games". I'm not sure if this is a new game or if it's another slogan.
One interesting thing I've noticed that I don't think has been mentioned here is that GSN has registered the names "Extreme Dodgeball" and "World Series of Dodgeball". Both were registered a month ago.
Other than that, the only new trademarks are the already mentioned "World Series of Blackjack". GSN has saw fit to also register "World Blackjack Tour" and "Worldwide Blackjack Tour". GSN is going to own Blackjack.