Abrams is going to double down on the elements from the Prequels I'm 110% confident.

He is going to most certainly bring back Vader at the end of TFA because first, he isn't that imaginative a director to break out of his influences and second, Disney will demand it. And we're talking about Hayden Vader as well, so that means we'll be seeing a lot of his force ghost in the new trilogy, I'm sure of it.

That probably means no OUT either, because that would confuse audiences as to why Anakin got younger in between movies.