We don't know if they have really changed anything on his moveset; however from what I have seen on the official Super smash bros blog, it seems that he will have mostly the same moveset:
http://www.smashbros.com/us/characters/marth.html
I can say that I am really happy that Marth is coming back (he is kinda my main); however I really hope that he will get a Lucina skin from Fire emblem awakening, since Wii fit trainer got a skin where they change her to her male form.
And that's all from me readers! Have a awesome day.
