I just installed kdevelop 4.0 on my Ubuntu machine and found that there are very few project templates (all related to Qt). I am not a qt developer, and there were many project templates in previous versions of kdevelop. I am not sure how to get common C and C ++ GTK templates.
A Screenshot from the old version of kdevelop: http://www.euclideanspace.com/software/language/cpp/kdevelop/kd2.gif
If you are using ubuntu, try installing the package kapptemplate. It does not contain as many templates as kdevelop 3, but much more than predefined ones.
kapptemplate
KDevelop 4 C ++ GTK.
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sudo apt-get install kapptemplate