I usually communicate with the Jupyter people via github. As Cedric says, you can use side effects (e.g. calls to display) to output multiple things.
You can also make your cell output a tuple: 5+5, 5+6, 5+7 but this does not give nice multimedia output and the formatting leaves something to be desired. I filed an issue for this, but no one has tried to implement it: https://github.com/ipython/ipython/issues/6345
