Will the old-style Facebook groups be converted to new-style Facebook groups?

Question

If they will be converted, has Facebook given any indication of its migration plan?

Answer 1

Since all new groups have notifications set on as default, I think there are still monitoring the load.

From Facebook Help New Groups Design

Currently you cannot convert an old group into the new group design.

You can read more on their blog.
New Groups: Stay Closer to Groups of People in Your Life