The fourth BETA release of version 2.2 - including CiviCase, Personal Campaign Pages, Soft Credits, Multi-value Custom Fields, cool new hooks for developers, and more - is now available for download. This release includes approximately 25 bug fixes. as well as some community-requested improvements:
Allow a user to register multiple participants using the same email address, and allow additional participants to be added without requiring email addresses for them.
Make it easier to explore CiviCase by including sample case types with configuration files in the codebase distribution (learn more...). You can also try out these sample case types - "Housing Support" and "Adult Day Care Referral" on the public 2.2 demo.
Configuration option to "turn off" the double-opt-in process when users subscribe to a mailing list via a Profile form.
Ability to Send Bulk Email from the Find Members search screen.
New hook to discount event fees when a user is registering multiple participants (e.g. you get a 5% discount for each additional person you register).
Option to completely replace CiviCRM dashboard content using the Dashboard hook.
You can use the automated upgrade script to upgrade from 2.1.x OR from any previous 2.2 alpha or beta release. This release will be fully upgrade-able to any additional beta versions as well as 2.2 stable. Please help ensure a quality stable release by downloading and testing 2.2 beta against a copy of your site and data.
... If this is your first look at 2.2, check out the 2.2 Roadmap for a good overview. Or you can review a compete listing of new features, improvements and bug fixes on the issue tracker.