Yes, is out!! Download at: https://www.microsoft.com/betaexperience/pd/SQLDCTP3CTA/enus/default.aspx
You must have a valid Live ID account to be able to proceed downloading the SQL Server Denali CTP3, and must allow to install the Activex control or use the Java Applet for the Download Manager to begin the process.
Don’t forget the read the Release Notes, and have fun with it!!