Seems the team doesn't have it on their roadmap although it will come with WordPress 5.0.
"Unfortunately, Gutenberg compatibility is not a current feature in our Calendar, however, you can submit a feature request for our Development Team to consider implementing for a future release of the calendar. "
That's what I am doing. Can't think of a reason why they wouldn't put it on their roadmap. 100,000+ sites will be in for a pleasant surprise when they see the Gutenberg editor being the default in their edit screens for AIOEC plugin.
If you don't know about Gutenberg, you can read up about it here