I didn't want to post on the subject yesterday, in honor and respect of Iwata-sama, but a day has passed and I will ay what I have to say.
I only see 3 possible candidates to take on Iwata's role.
1. Genyo Takeda = He is one of the Representative Directors and so, if Iwata didn't had a successor handpicked already, is the most likely to become Nintendo's next CEO, seeing the job he has been given, and how Miyamoto had mentioned some months/years ago he was beginning to think about retirement, so he is out of the question.
2. Satoru Shibata = He seems to have a good grasp of the market, Europe usually have a good amount of bundles that the fans have asked to come out of Japan, so he could be a good man that can lead to Nintendo have a better sense of the worldwide market, and not only Japan.
3. That guy in the Japanese Micro Direct = Yes, him. He was said to be just some PR guy, but that is exactly why I have a suspicion he may be Iwata's handpicked successor, Nintendo Directs not directed by Iwata always had a important figure from Nintendo or the developer of the games as the directors of it, but for this Direct some random PR guy was chosen for the job, since the day I aw him, I always ahd the suspicion he may be Iwata's successor.
COMG guide to points: 1 point = Raging. 2 points = Beasting. 3 points = Tearing it up. 4 points = Berzerk. 7 points = Rampage. 12 points = Burst. 15 points = god mode. 20+ points = DIVIDING BY ZERO!!! 40+ points = Youkai (originally Pokemon).
-1 = Negabeasting. -5= NegaRampage. -10 = NegaBurst