KC:D is essentially the content of what was planned for Act 1 and Act 2 in a single package.
Once the release is done, and patches and dlcs have been finished and made available the next focus will be shaping Act 3 content and extensions to it into KC:D II (or whatever the actual final title will be).
The original offer for KC:D was act 1 content, with another two acts to follow, so most of the original backers are currently getting ‘around’ twice what was originally planned.
Anyone buying in over the last year is getting what they were offered. Nothing has been cut back or removed to gouge the customer, but some bits of planning got moved about to release more of the game in the first package, and some relatively minor features were ‘below the fold’ when the content was frozen so will have to wait until either patches/dlc or the second title.