Ok guys, let's think about this logically.
Olimar has been in both daily pics the day of a nintendo direct, obviously he's the constant here, signifying that there's going to be a character reveal.
Now in the first pic, it was olimar and kirby, with a luigi reveal.
Considering that olimar is the constant, we're led to believe that the correlation is between kirby and luigi.
Notice how they have the same amount of letters in their name:
K I R B Y
L U I G I
Now, in today's pic we have olimar and wii fit trainer, if we apply the same formula to this image:
W I I F I T T R A I N E R
? ? ? ? ? ? ? ? ? ? ? ? ?
13 letters, now, the fact that it's a newcomer with olimar instead of a veteran like last time, means that this reveal is either going to be linked to an unnanounced game or not even linked to a game at all.
Who fits this criteria?
C A P T A I N F A L C O N
Captain falcon confirmed, it's basic science! You can thank me all later.