The Foundation is definitely built for a 2D grid in mind. But using the logic involved you could expand into 3D space.
I want to offer as much support as possible, so if a certain feature gets enough requests, I will try to make it possible either through video tutorials or via updates to the project.
As far as availability, the project is currently under review by Epic, I will keep everyone posted.
In the meantime, let me know what you think is the coolest feature that you’ve seen in a Match-3 game?