wxPython 4 is here and supports Python 2.7 and 3.5. It can be found on PyPI - https://pypi.python.org/pypi/wxPython and is installed via pip:
pip install wxPython
If you want to try the bleeding edge, there are snapshot builds here:
- http://wxpython.org/Phoenix/snapshot-builds/
You will also want to check out the Migration Guide and the Classic vs Phoenix documentation page for more information about the changes to wxPython