That's definitely in the plans! Multi-step or multi-page forms are pretty far out, but conditional logic is pretty high on the list.
One of the great aspect of Fetch Forms is that both of these can done right now with some code on the front the frontend. Conditional logic would be tricky with validation, but multi-step forms would be fairly since you'll probably already have a build the step workflow yourself. You'd just pass in the appropriate fields from the Fetch Form to each step.