WordPress 4.2 landed last week and fully supports emoji. If you previously used emoji in a post, WordPress would fail to save the post and in some cases even lose the text you’d written.
With this latest update, you can use emoji essentially anywhere (including in your URL slug, if you dare to try it.
One word of warning: adding emoji to titles sometimes has unexpected results if your readers aren’t on the latest version of their browser, even though WordPress officially supports it.
WordPress 4.2 adds support for a number of new embed types, such as Tumblr and Kickstarter, which are formatted automatically for inclusion in your posts.
Source : The Next Web