I'm not sure specifically what the 'enel cover story' is about as there could be many different 'enel' related cover stories in various contexts. It could be about the company Enel's new initiatives, its corporate social responsibility efforts, or a particular event related to it.
I haven't heard anything definite. Maybe there's a chance, but it could also be that the story has reached a natural conclusion. We'll have to keep an eye out for official announcements.
I'm not sure. It could go either way. Sometimes characters come back in unexpected ways in manga. Maybe there'll be a twist that brings Gojo back into the story.