I have installed in Window 7 environment Anaconda 2.0. The default Python is 2.7 but also Python 3.4 is installed. I am able to activate Python 3.4 with the command "activate py3k". After this Spyder IDE does work right with Python 3.4 But 1) I'm not able to start Ipython Notebook and QT Console with Python 3.4 2) I'm not able to start Anaconda with Python 3.4 as default (so that also launcher starts the three apps -Spyder, Ipython Notebook and Ipython QT Console with python 3.4)
The launcher always points to the root environment (Python 2). If you have activated the Python 3 environment, you can launch the notebook by just typing ipython notebook (and the same with the qtconsole with ipython qtconsole).