Here are the direct links to the Barnes & Noble bookseller page:
The One and Only: A Maryellen Classic Volume 1
It is assumed the third journey book will be The Sky's The Limit: A Journey with Maryellen
*Note: It is possible the name may change before the character is released.
According to the previous information Jenny shared with us from the Amazon website, the books will be released Aug. 27th and the author is Valerie Tripp.
Thank you very much for finding and sharing this news Jenny! ^_^