You can find these versions by yourself by looking at the
Oracle Solaris 11 Package Repository
For example for gtk+, search for gtk, you'll find there are two packages, library/desktop/gtk1 and gtk2. Clicking on their full name will tell the first one is 1.2.10 and the second one is 2.20.1.
Python has four versions available runtime/python-24, -25, -26 and -27.
and so on.