To update on the current situation: * I have uploaded forked python 2 source packages of ipython, ipykernel and prompt_toolkit in order to allow ipython2 to be kept for the time being while unblocking the upgrade path for ipython3. These are currently waiting in NEW. * I have uploaded python-backcall (new dependency for ipython >= 6), also waiting in NEW. * I have started a transition for prompt_toolkit (version 2 required for ipython >= 7), given that this is an API-breaking change and there are other blockers.
Once packages have cleared NEW, ipython3 will be updated, Depending whether the prompt_toolkit transition takes longer, there might be an intermediate upload of ipython 6.x until it is possible to upload 7.x.
