I'm probably jumping the gun, but I am leaning toward it being real. In the previous two cycles, I held out hope that the rosters were false because the cuts were devastating to me (Roy and Mewtwo/Lucas, Squirtle, Ivysaur, Wolf, Ice Climbers), even though they had the ring of truth. Since there are no cuts this time, everything is gravy, so I am pretty happy for any new characters at all.
And we still have potential DLC coming, so it's not even the end. Since again this is probably my final Smash, I can still hold out hope that I will be able to have more of the characters I want be able to battle it out in my favorite fighting game/party game. I can still hold out hope for Rowlet (love you, Mom!).