I understand that ipython is not virtualenv-aware and that the most logical solution to this is to install ipython in each virtualenv seperately using
pip install ipython
alias ipy="python -c 'import IPython; IPython.terminal.ipapp.launch_new_instance()'"
This is a great way of always being sure that the ipython instance always belongs to the virtualenv's python version.
This works only on ipython >2.0.