This video explains and shows the new features found in iMovie 10.0.3

Full changelog from apple about what’s new in iMovie Version 10.0.3:

• Option to sort events in the sidebar by date
• Change the font, size, and color of new titles introduced in iMovie version 10
• Double-click a transition in the timeline to adjust its duration
• Crop and rotate clips in events
• Add speed effects using the Adjustments Bar
• Option to smoothly transition in and out of speed effects
• Fixes issues that could cause iMovie to quit unexpectedly
• Resolves issues that could cause sharing to fail
• Improves reliability of search when using partial or multiple search terms
• General usability improvements on computers using certain languages