I wish they added this earlier! When my team worked on the Anaplan Covid19 Hackathon, we ended up creating our model in Anaplan Classic since map charts weren't supported in the New UX.
I hope in the future we can display more line items in the box that shows up when you hover over a map item (currently you can only have one), and that the maps can be configured to be more interactive--with users being able to toggle in and out at different levels of a map hierarchy.
This is a very nice feature and perfect for planning out projects and tracking out deadlines. I haven't used Gantt charts in the classic, but this is definitely a feature I'll explore. Anaplan has a nice video displaying the feature, which I've linked below.
Being able to send notifications out to users from within Anaplan allows users to stay longer inside Anaplan. This greatly speeds up sharing of information, as previously, users would have to export data/charts and email them using an email service.