Board Thread:Episode Discussions/@comment-1181222-20170726102202/@comment-25632268-20170727095400

Vladosaurus wrote: So Naruto becoming the Hokage will be only a flash back? It seemed that it will be the main focus of the episode based on the preview. Actually, it's the only thing showed in the preview.

Yeah, previews are like that, nothing new.

OVA was 10 minutes long, so stretching it into whole episode would require to literally making a second OVA.