John wants to add new creatures but for this he wants to have some other stuff in place first.
John and Eddie are fixing the known bugs from this last version update 0.5.0.
I guess that it will be done before the end of the year and assuming that is true this will be the roadmap towards more creatures.
First weeks of 2013 : build crafting into the game > testing it and stuff, hope all will go smooth.
Last weeks of 2013 : Bigger terrain > Mining > hopefully more creatures > Skills
If John and Eddie would work this out in upcomming month or even 2 months it would indeed give much more to do in the project.
To check out progress you can also visit the wishlist on the website. https://sites.google.com/site/gameprojection/Project-Ion-Wishlist