And possibly will be entirely canceled. This is due to manufacturing issues. In short, the printer I used for Series One made some changes and can no longer print cards that the e-Reader will successfully scan.
I am on the search for a new printing process, but that can take a lot of time. It is also possible I won't find a reliable new way to print cards.
It was always planned to release a GBA version of the game. We have pivoted to that version and it is going very well. Check the Pixel Pup page for more details.
My remaining stock of Series One is all that will be available. The US version in particular is getting low in stock, so if you want a pack you might want to grab one soon.