What's new? I haven't been following bootstrap 4, ( especially since I switched to http://semantic-ui.com/ ).
* I see a list of themes priced at 100$ :/ (maybe that's a good thing?)
* "Moved from Less to Sass". OK, that's a late addition but always welcomed. (Although there was already an unofficial sass version of bootstrap.)
* "Opt-in flexbox support is here". Why would flexbox not be opt-out?
* "giving you more opinionated resets like box-sizing: border-box". About fucking time.