When is bootstrap 4 coming up? Since August 10, 2017 Bootstrap 4 Beta is available. The new version of Bootstrap is now in beta and has a lot to offer. The change from Bootstrap 3 to Bootstrap 4 and the changes and new features are explained here.
Is not just a stylesheet language, much more so, a preprocessor. It facilitates the input of CSS.
Bootstrap 4 looks very promising and already usable.
At the moment we would not recommend it, but it can change every day.
Please contact us to find out if Bootstrap can help your project.