I am not sure where to file bugs or PRs for this, but currently http://dist.plone.org/release/4-latest/versions.cfg
references plone.app.contenttypes 1.1b5 which depends on plone.app.event which itself is not pinned at all.
plone.app.event 1.1.x will work find, but plone.app.event 1.2.x and 2.x depend on plone.app.widgets which changes the gui a lot, and which should not be part of a 4.3.x release.
Where do I file bugs/PRs for this?