With the next major version Cinema 4D R17 (SP1 to be precise) we will move from Python 2.6.4 to Python 2.7.9.
From then on Python 2.6.4 will not be used anymore.
The reason for this decision were minor issues in Python 2.6 and increased compatibility with other 3D packages.
In most cases this change should be no problem. Tests with existing scripts/plugins showed, almost
all scripts, plugins, etc. are compatible with Python 2.7. Only in very rare cases adjustments need to be made.
If a plugin is based on a Python C-module, this module needs to be recompiled. Latest Xcode version and Visual Studio 2012 SP4 should be used for this.