The new tree species in the Open edX named release space is called Birch. This one was first released on february 2015 and it includes some very interesting new features, such as:
- Split Mongo Modulestore
- Cohorts for Discussions and Content
- Content Libraries and Randomized Content
- Prerequisite Courses
- Entrance Exams
- Student Notes
- Course Reruns
- Google Calendar and Google Drive Xblock Components
- Support for Graded Problems in Content Experiments
- REST APIs
Find out more about this release in the official release notes
