User blog comment:Miskos3/Fairy Tail Anime Returns in April/@comment-3424593-20140316192918/@comment-7418318-20140316195351

I think they'll do something like Naruto Shippûden and Magi Season 2 did.

They'll show a short (less than 5 mins) montage of the alternate future and then they'll go back to the story of chapter 300. And then when Future Lucy wakes up in that dining hall, she'll tell them about her time and that's when we see the actual episode(s) of the future.