Probably if you are updated with the news abroad the front-end community you know that Bootstrap 4.0-alpha6 was released. But what actually was changed for us developers?
The alpha version is obviously incomplete still and shouldn’t be used just yet on production, they are still changing the syntax, adding and removing features, so it’s just a preview for you, I not recommend you to use yet in production projects, just in hobby projects to getting used.
Bootstrap’s now uses SASS! In older versions, it used Less as its main preprocessor. It wasn’t even until version 3.0 that a Sass port was created.
... read the whole story at medium.com.