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Thanks for your interest in iMovie: The Missing Manual. It appears as if this book would fit your needs as the upgrades made for iMovie Version 10.0.6 are:
"Updated look for OS X Yosemite
New file export options including Custom H.264, ProRes, and Audio Only
Share any video frame as an image"
This information was found here: https://itunes.apple.com/us/app/imovi...
These upgrades don't appear as if they alter the main aspects of iMovie, and the content of this 432 page book should be helpful to you. Have a great day!