After updating the portage tree I got the following ebuild conflict:
WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict: dev-python/ipython:0 (dev-python/ipython-6.1.0-r1:0/0::python-modules-kit, ebuild scheduled for merge) conflicts with dev-python/ipython[python_targets_python2_7(-),python_targets_python3_6(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3 _5(-),-python_single_target_python3_6(-)] required by (dev-python/qtconsole-4.3.1:0/0::python-modules-kit, ebuild scheduled for merge) <dev-python/ipython-6[python_targets_python2_7(-),-python_single_target_python2_7(-)] required by (dev-python/ipykernel-4.8.2:0/0::python-modules-kit, ebuild scheduled for me rge) ^ ^ >=dev-python/ipython-4.0.0[python_targets_python2_7(-),python_targets_python3_6(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target _python3_5(-),-python_single_target_python3_6(-)] required by (dev-python/ipykernel-4.8.2:0/0::python-modules-kit, ebuild scheduled for merge)