Unfortunately, as of today, Pekka Kana 3 was never released, and Pistegamez won't work on it anymore.
Pistegamez only provided some teasers and fans provided some leaks which were shared, with permission of the devs.
There were attempts from fans to create Pekka Kana 3 but nothing significant has been done yet.

All the public PK3 content, both official and fanmade is linked down below!