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:
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card-block class renamed to card-body
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popover-title class renamed to popover-header
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popover-content class renamed to popover-body
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$brand-primary and other $brand- variables renamed to $primary etc...
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$nav-disabled-link-color renamed to $nav-link-disabled-color
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$font-size-h1 and other font-size-h_ variables renamed to h1-font-size etc...
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$nav-tabs-active-link-hover-color renamed to $nav-tabs-link-active-color
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$nav-tabs-active-link-hover-bg -> $nav-tabs-link-active-bg
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$nav-tabs-active-link-hover-border-color -> $nav-tabs-link-active-border-color
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$nav-pills-active-link-color -> $nav-pills-link-active-color
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$nav-pills-active-link-bg -> $nav-pills-link-active-bg
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$font-family-serif variable is removed
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$modal-content-sm-up-box-shadow renamed to $modal-content-box-shadow-sm-up
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@button-size mixin now requires additional line-height argument
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input-group-addon is now input-group-prepend and text inside on prepend should be wrapped in input-group-text class
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Renamed __alerts.scss to __alert.scss in /scss/bootstrap-override/ folder
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Renamed __badges.scss to __badge.scss in /scss/bootstrap-override/ folder
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Removed from v4 alphas: .hidden-xs-up .hidden-xs-down .hidden-sm-up .hidden-sm-down .hidden-md-up .hidden-md-down .hidden-lg-up .hidden-lg-down
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Now if you want your button to have uppercased text like in previous version - you should add class .btn-upper to it.
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Added popper.js (https://github.com/FezVrasta/popper.js/) to the list of assets since it's required in bootstrap 4 for popups