Serebii's been speculating again...
http://www.neogaf.com/forum/showthread.php?p=157389145

>original thread
>>23114035

>Famitsu interviewed Masuda and Morimoto last week
http://nintendoeverything.com/famitsu-dswii-teases-announcement-of-a-big-game/

>Serebii has seen placeholders for merchandise for 5 unnanounced characters, possibly new forms
>These merchandise placeholders have been used to disguise new forms in the past, for example:
Mega Mewtwo: http://serebii.net/news/movie16.jpg
Zorua and Zoroark: http://www.serebii.net/movies/celebi/newpoke.jpg
Shaymin Sky Forme and Giritina Origin Forme: http://www.serebii.net/shayminpen2.jpg

>The merchandise listings had 8 slots, 6 hidden:
Pikachu
Hoopa Confined
Character A
Character B
Character C
Character D
Character D (again!?)
Character E

>Mega Evolution Act IV releases in Autumn 2015, could contain a new mega or 2
https://www.youtube.com/watch?v=xYFlL6zlRK0

>2016 is Pokemon's 20th Anniversary