When using a Keynote Widget with iBooks Author, do the transitions and builds between Keynote slides appear in the iPad preview version of the iBook, or only in the finished product?

Not sure about your case, but I've seen preview not perform the same.

Share/export your book as .ibooks file, drop into iTunes, sync w/your iPad and test for real.

magic move should work, it;s on the list of supported transitions

see here:

http://support.apple.com/kb/HT5067?viewlocale=en_US&locale=en_US

maybe its a specific paramter in magic move you have used that is not supported?

Hyperlinks and magic move should work but don't. However I found the following as a workaround for me. Use three slides instead of two to generate the magic move effect in Keynote presentations on Ibooks using hyperlinks only. As an example

Supose an object on slide 1 was set as a hyperlink to go to a slide which then had a magic move effect to a third slide. For some reason it works on the mac, but not on ibooks. However you can create the magic move transition effect by simply adding a "dummy slide" as follows. Suppose an object on slide 1 had an object which would hyperlink to slide 4. Duplicate Slide 4, and make the duplicate slide 5. Then set Slide 4 to automatically transition (with no effect) to the next slide (i.e. slide 5) after .5 seconds. Have Slide 5 set to transition to Slide 6 using magic move automatically after .5 seconds. By having the hyperlink point to slide 4 the magic move effect from Slide 5 to Slide 6 works fine (with a brief 1 sec delay). IF the hyperlink pointed directly to Slide 5, the magic move transition to slide 6 would not work.

For some reason having an extra slide makes magic move work even though it is not needed on the mac. I hpe this helps.

This worked for me. Thank you.