Nope! The full game will be 100% free :)
There will, however, be a completely open-source version released on the Creative Commons license which will cost somewhere between 5 and 15 USD. This version will be unencrypted and will allow users to make use of the code, assets, world and characters for whatever purpose they want! Either as a template for their own game, an extension to CK, modding, or whatever else they can think of.