For a full list of updates from alpha to final version of Bootstrap 4.0.0 you can read official bootstrap blog: http://blog.getbootstrap.com/
These are the changes I've made inside the template due to updates of Bootstrap 4.0.0 Final:
- card-block class renamed to card-body
- popover-title class renamed to popover-header
- popover-content class renamed to popover-body
- $brand-primary and other $brand- variables renamed to $primary etc...
- $nav-disabled-link-color renamed to $nav-link-disabled-color
- $font-size-h1 and other font-size-h_ variables renamed to h1-font-size etc...