One of the items that gets updated every year is the Emoji that are available. While the codes that define emoji are standardized, how they look on the different platforms is up to each platform vendor. This is because the look of emoji needs to fit into the overall look and feel of the platform.
For Apple, an emoji update comes after the release of their new operating systems in the fall. Typically in the .1 update, so this year should be iOS 11.1 and macOS High Sierra 10.13.1. Some of the new emoji that are arriving later this year are:
There are 69 new emoji that are in the Emoji 5.0 specification. A complete list can be found on emojipedia.org