At the end of January 2013, Articulate released the fifth update to Storyline 1. This is the fourth “large” update since Storyline was release in May 2012. The January release contains 49+ changes. In my book, that’s a large update.
From a quick glance at the list of enhancements and defect fixes, it appears that a fair number of them are related to HTML5. Since producing content for mobile devices and particularly the iPad is a requirement these days, it makes sense that this relatively new tool (Articulate), should maximize it’s compliance with HTML5/iPad/Safari technology.
Two releases are named “Update 4.” Update 4 (1311.817) was released November 11, 2013 and contained 37+ updates. Update 4 (1311.1422) was released a few days later, November 15, 2013, and contained one update.
Read more about the updates (abbreviated release notes), here: http://www.articulate.com/support/storyline/issues-addressed-in-the-latest-articulate-storyline-update