+* Plumbing level subproject support.
+
+ You can include a subdirectory that has an independent git
+ repository in your index and tree objects as a
+ "subproject". This plumbing (i.e. "core") level subproject
+ support explicitly excludes recursive behaviour.
+
+ The "subproject" entries in the index and trees are
+ incompatible with older versions of git. Experimenting with
+ the plumbing level support is encouraged, but be warned that
+ unless everybody in your project updates to this release or
+ later, using this feature would make your project
+ inaccessible by people with older versions of git.
+
+* Plumbing level gitattributes support.
+
+ The gitattributes mechanism allows you to add 'attributes' to
+ paths in your project, and affect the way certain git
+ operations work. Currently you can influence if a path is
+ considered a binary or text (the former would be treated by
+ 'git diff' not to produce textual output; the latter can go
+ through the line endings conversion process in repositories
+ with core.autocrlf set), and specify a custom 3-way merge
+ driver.
+
+* The packfile format now optionally suports 64-bit index.
+
+ This release supports the "version 2" format of the .idx
+ file. This is automatically enabled when a huge packfile
+ needs more than 32-bit to express offsets of objects in the
+ pack
+