A posting by Deng-Kai, Associate Product Marketing Manager for Google Mobile, on the Google Mobile blog indicates that all of those who pre-registered for a Google Voice invite will be receiving them soon as the company begins to roll-out this latest service offering. Google Voice is the successor to form GrandCentral, compiling a service that allows you to manage multiple telephone lines with a single number. This gives you access to all voice mail and allows you to set conditions to manage which calls are forwarded to which number. The service also includes visual voicemail.
Visit the Google Mobile blog for the official announcement or visit the official Google Voice page.