Although the old "why?" photo was easy for students to remember because of the man's arms in the shape of a "w", many students confused the word "why" with the letter name "y". As a result, the keyword for "w" has been changed to "water".
There have also been some updates to the formatting of the Long and Short Vowels pages in each book (for example, see the slightly different variation of page 32 in abc English: Book One). See the full preview with all of the updates here.
If you purchased abc English books before July 2017, you can update your books by printing these update files: