I’m not sure I’ve heard of MAUI talk, but I’m only loosely following Duplicati planning.
You can look at the couple of pull requests, and there are a lot of single-topic issues.
There has been talking of replacing the current AngularJS UI, but nothing specific…
If you would like to contribute to a port or to bug fixes and features, there’s lots to do.
Duplicati is typically looking for volunteers in all areas. Progress is slow without help.
EDIT:
I found the prior discussion I was thinking of (you commented I see). Anyway, re UIs:
Apologies for getting off-topic, but mono led to .NET 6 led to MAUI led to UI in general.