This came in an email list I seem to be a part of...

Chips
There are three new chip releases coming this month. Carson Daly will be filming Last Call at the Hard Rock Hotel later this month, so we came out with a chip. They'll be in limited supply. The $5 chip will be released at 7pm on Thursday May 20th at the cages.
www.hardrockhotel.com/pindex/Carson-Daly.jpg

Dido is also performing at the Joint over Memorial Day weekend, so we wanted to thank her for giving us the best time. This new $5 chip will be released just as the weekend is getting started, at 10am on Friday May 28th. Also limited in supply, be sure you don't miss her, she'll be waving her White Flag.
www.hardrockhotel.com/pindex/DIDO.jpg

Finally to be released - the $25 STING chips. If you have the $5 versions you can not miss the beautiful purple version. After seeing it I feel we should have made a lot more than 750. To be released at the same time as Dido, May 28th, 10am.
www.hardrockhotel.com/pindex/Sting-$25.jpg