Apple's latest design removed those empty spots.[1] But don't despair, you can already get a lot of what you want without dedicated buttons.
To open an emoji menu in OS X (10.10 or later IIRC), just focus on a text input and hit ^ + ⌘ + spacebar. You can also search for other unicode characters. "⌘" is a little tricky to find, since it's named "place of interest marker" or something like that.
OS X doesn't yet have Siri, but it does have Dictation. I assume that when Siri replaces Dictation, the typical keyboard shortcuts for toggling it will stay the same: double-tapping fn or ⌘.
To open an emoji menu in OS X (10.10 or later IIRC), just focus on a text input and hit ^ + ⌘ + spacebar. You can also search for other unicode characters. "⌘" is a little tricky to find, since it's named "place of interest marker" or something like that.
OS X doesn't yet have Siri, but it does have Dictation. I assume that when Siri replaces Dictation, the typical keyboard shortcuts for toggling it will stay the same: double-tapping fn or ⌘.
1. http://geoff.greer.fm/photos/pics/IMG_1269.JPG