Hey Marc,
You are absolutely correct that it is on the roadmap, that said it isn't close to be ready and I don't have an ETA at the moment. I would advise to stick to using ACF or Carbon fields which offers a lot more flexibility than Beans Fields at this stage.
Thanks for your understanding,
Hi Marc, I use Carbon fields and it's really great :-). I use repeater field and flexible content like, which is named complex field in carbon field. I am doing a theme builder with that, and will soon post a demo. Tell me if you need help