This project is no longer necessary as nearly all its patches have been contributed to Drupal 8.
This project is a branch of Drupal 8 whose purpose is to bundle a WYSIWYG editor into core. This project is a branch of Drupal core (rather than a branch of the existing WYSIWYG module) because the approach used in this sandbox integrates tightly into the Filtering system.
CKEditor has now been decided as the WYSIWYG for Drupal 8, see.
Instead of using this project to test the CKEditor functionality, it's recommended to simply install the http://drupal.org/project/wysiwyg_ckeditor project for Drupal 8, which is targeting to be a drop-in module for Drupal 8.
This project includes multiple patches, each applied to a separate branch:
The branches are cumulative, so the latest branch (03_new_filter_cleanup) includes all of the other ones. If you want to test out all of the functionality together, use the latest branch. The latest branch is also running in a demonstration mode here: http://quicksketch.org/wysiwyg/
Please watch this video from DrupalCon London as an introduction into the WYSIWYG discussion: