Cantor has some interesting new concepts for sports betting, including live betting throughout the game. They just opened a new book at Tropicana, and also have locations at M Resort, Venetian and Palazzo.
When Cosmopolitan opened in December it did not have a "traditional" sportsbook. Instead the Book & Stage lounge served as a place where you could place wagers. The betting terminals at Book & Stage will remain open.
I know Cosmo caught some flack for not having a real sportsbook. I wonder if this is a direct response to that, or if it was planned all along. It seems like sports weekends are a huge part of Las Vegas with the Super Bowl and March Madness. Having a legit sportsbook would almost seem like a requirement for any casino resort.

For more information, see the Press Release and Cantor Gaming.