After a lot of discussion and testing, we decided to adopt the Aloha Editor as the WYSIWYG editor for Spark, and possibly for Drupal 8 core. Check out Wim's blog for the details. In short, it is the best HTML5 based WYSIWYG editor; fast, well-written and future-proof.
Here is a screenshot of our latest designs of how we envision integrating the Aloha Editor in Spark on a mobile device:
I also wanted to give a big thank you to Haymo Meran, creator of Aloha Editor and Director of Product Experience at Gentics Software GmbH, both for hosting a Drupal/Aloha collaboration sprint at his company's offices in Vienna last month, and also for changing the license of Aloha Editor to GPLv2+ (from AGPLv3) so that it could be used with Drupal!
It's an incredible gift to the Drupal project and the Open Source community at large. Thanks!
Updates from Dries straight to your mailbox