SQL Server 2012 introduces several significant enhancements to spatial types, such as support for new subtypes of circular arcs, new and updated methods and aggregates for all subtypes, improved precision, and updates to the geography type.
More info:
New Spatial Features in SQL Server Code-Named “Denali”
Video Microsoft SQL Server Beyond Relational Landscape: Current and Future
Geospatial Support for Circular Data in SQL Server 2012