Okay....so I was scrolling down fb and suddenly saw a post from SM Town. It says...in quote....

" **SMTOWN ARTISTS REVEAL THEIR CHOICE FOR IGAB MV** [SJ] 

Donghae - Jessica and Yuri
Sungmin - Sunny and Taeyeon
Eunhyuk - Sunny and Hyoyeon
Siwon - Yoona and Tiffany
Ryeowook - Yoona and Sooyoung
Kyuhyun - Seohyun
Kangin - Yuri and Yoona
Yesung - Seohyun and Jessica
Shindong - Tiffany

**Super Junior M || Members Voted by SNSD in Break Down MV**
Jessica - Donghae and Henry
Yoona - Ryeowook
Yuri - Kyuhyun
Seohyun - Kyuhyun
Sooyoung - Sungmin and Siwon
Tiffany - Siwon and Donghae
Hyoyeon - Zhoumi and Eunhyuk
Sunny - Eunhyuk and Sungmin

SM TOWN "

That is Super Generation there.....

‎" [not confirm] 소녀시대(Girls' Generation) Maknaes Yoona and Seohyun are going to be in (EXO엑소) MV

Yoona role in EXO-K and Seohyun role in EXO-M
SM TOWN " 

Even though its not confirmed yet, I hope its CONFIRMED!