Firstly I just want to say a big thanks (to you and your sponsors) for getting cross platform cefpython up and running again!!!
On a related not, the wxPython Phoenix project has just dropped it's first (alpha) release!
I've done some initial testing on Windows and there's a couple of little changes required to the wxpython.py sample app to support the pheonix api:
* wx.Timer needs a different method of binding the event
* wx.Panel().GetClientSizeTuple() is gone, replace with wx.Panel().GetClientSize().Get()
* OnExit() should return an int.
Full working code attached, or I'm happy to make a pull request if you're interested?