Notes:

Tumblr user drlilrobot discovered a new octoling face, matching the inklings' expression after losing a match.
This discovery hints at the possibility of playable octolings in the future (or they'll at least be more involved in gameplay.)
http://drlilrobot.tumblr.com/post/125979779643/they-added-more-faces-to-the-octoling-to-match-up