I sure hope so! I definitely saw them on our last trip, but that was September 2016. We’re planning to get one for our 6 year old for our upcoming December trip. He’s studying Chinese and I think he’ll enjoy talking to the CMs in the China pavilion.
At each pavilion in World Showcase, there's a CM from the represented country who will stamp their passport book and write their name or a message in their language. My kids loved this and getting photos in each country.
Just looked on Amazon and the passport kit including passport, stickers, and Epcot button came up at almost $30. I could swear I've previously seen a much less expensive passport only option on there but I couldn't get it to show up now. Etsy has $5.50-$50.00 options depending on various options like stickers and even educational information on each country. How much are they in Epcot shops now?