Spacemacs is not just emacs+vim. It can have OSX keybindings too! This layer globally defines common OSX keybindings. ⌘ is set to super and ⌥ is set to meta. Aside from that, there's nothing much, really.
While in dired this layer will try to use gls instead of ls.
To use this configuration layer, add it to your ~/.spacemacs. You will need to add osx to the existing dotspacemacs-configuration-layers list in this file.
If you have problem entering symbols that are behind the ⌥ key you may want to added this to the user-init in the .spacemacs-File. This will allow you to use the right ⌥ key to write symbols. The left ⌥ key can be used as the Meta key.
To get the list of available dictionaries call osx/list-available-dictionaries function.
Allow user to choose from either hyper or super as ⌘. This is an option that is supported cross-platform.