Here is the list of features and bugfixes in 2.7:

2.7 Changes
Features
- Cache manager
- default 4.7.x cache handler
- New Selection tree in UI, with Async loading
- New comparison framework
- Packaging now does ongoing comparison, if it knows the target
- Hashing utility for quick comparison 
- Cache manager support for multiple collections of Courier cache files
- Courier has native plugin support in nant
- Persistence Provider can execute raw quries


Bug Fixes
- New LocalLinks Resolver, about 200% faster
- New MacroParameter resolver, also 200% faster
- Support for macro-container out of the box
- Fixed Relations NH mapping
- Improved IO handling
- Fixes broken UNC path resolver
- Fixes issue with resolving macros, when element is on char[0]
- Moved Resource Resolution to a seperate ResourceResolver class
- Changed IpackaginTarget and IExtractionTarget to support remote comparison
- Removed 50% of the resolver calls made, by better detection of need for resolution
- Refactored the Dependency graph, faster and better suppport for lazy loading
- Inherited properties was missing values on doc type update
- Overload to load repos by exact path and not just its alias
- Support for for colorpicker
- Fixes keyvalue support in case of missing values in collection
- Fixes missing licenses exception

Breaking changes
- Removed the ExtractionManager class, which has been deprecated since 2.5
  Replaced with Core.Extraction.RevisionExtraction, or as a Task.Extraction

Tasks
- Moved the core files to /core
- Moved all providers to /contrib/[projectname]
- Refactored build process
- Setup all contrib projects on github