Well, in the article the following was stated:
"The planned release date was changed to resolve a design issue with the stamp booklet, according to Phil Legault, media relations manager with Canada Post. The stamp will be available for sale online on Nov. 20 and in post offices later that week."
Someone over at the SCF posted booklets he was able to purchase before they were pulled. I guess we have to wait until Nov20 to figure out what the differences are.