See more here:
Welcome to the Gemini Team Blog!
Gemini is the code name for the new breakthrough Self-Service Business Intelligence (BI) capabilities being delivered in the SQL Server 2008 R2 release. Gemini enables end users to build BI applications by integrating data from a variety of sources, modeling, refining and analyzing the data, adding business logic, building reports and visualizations and ultimately sharing it with their coworkers in an environment that is managed and secured by IT. See SQL Server 2008 R2 | Self-Service Business Intelligence for more information.