This is for those who are already playing around with Kirby 2 Beta 1 which was released this monday.
This is a very early version of Kirby 1. So the migration from Kirby 1 to Kirby 2 is still a bit rough. When there is a stable version of Kirby 2 you probably won't have to update any of your plugins to make them work.
I've made some changes and for me it's working fine now. If you are searching for a Kirby 2 version of vladstudio-kirby-comments, you should take this one.