I was recently looking for a potential release date for Release 8 for Microsoft Dynamics CRM 2011 ( aka Update Rollup 9 and CRM Q2 - 2012 Update) and found that the Microsoft Field Engineering team maintains a post with information and projected release dates of the CRM Update rollups. The R8 release has a lot of great features including cross browser support, one of the features about which I have been frequently asked. The current expected release dates for all CRM 2011 and CRM 4.0 Update Rollups can be found here:

http://blogs.msdn.com/b/crminthefield/archive/2012/05/10/microsoft-dynamics-crm-4-0-and-2011-update-rollup-release-dates-build-numbers-and-collateral.aspx

There is a lot of great information in this post, including version numbers, kb article, hyperlinks, and a podcast with details of the Update Rollup.  

Be aware that Release 8 IS NOT the same as Update Rollup 8 (UR8) which was released in early May but rather is actually Update Rollup 9.

For more detail on what is included in Release 8, use the following link.

http://blog.customereffective.com/blog/2012/02/big-news-in-dynamics-crm-q2-2012-update-mobile-ios-and-android-versions-cross-browser-support-social-upgrades.html