Here's Harrah's press release on plans to build an arena behind Paris/Bally's. Jason and Billy alerted us to it earlier today.
"Harrah's Entertainment, Inc. (NYSE: HET - News) and AEG today unveiled plans for of an approximately 20,000-seat, privately financed, state-of-the-art arena. This arena is envisioned to be Las Vegas' new home for the most popular and important sports and entertainment events. The site of the venue will be one block east of the world famous Las Vegas Strip on approximately 10 acres of land that is part of the current Harrah's land holdings."