WordPress 5.0, the next major release, is scheduled to come out on November 19, 2018. It will come with a new editor known as Gutenburg.
However if you install and activate the “Classic Editor” plugin before upgrading to WordPress 5.0 you can continue using the current editor.
Gutenburg still seems to have a fair amount of kinks to iron out. Also, many plugins are not yet compatible yet. For now we recommend using the Classic Editor.