In three weeks, at 2017-01-31, the sprint starts in Innsbruck, Tirol, Austria.
There is still room for curious people who want to dive into topics like Zope 4, Plone on Python 3 + Zope 4, Plone Core Dev.
For more information see also the old Sprint announcement at plone.org and at the main Alpine City Sprint 2017 coactivate project.