After two years in the making, Bootstrap creators finally released first beta of Bootstrap 4. In latest version of Bootstrap 4 more then 650 files was changed, 67k lines was added, and 82k lines was deleted.
Bootstrap 4 is a major rewrite of the entire project. The most notable changes are summarized below, followed by more specific changes to relevant components.
Bootstrap 4 is just round the corner. Bootstrap 4 is a major rewrite of the entire project. Here is list of major changes in latest version of Bootstrap