Draft "What's new" page for Bundler 2.4

source/v2.4/whats_new.html.haml

@@ -9,17 +9,56 @@
     includes context and a more detailed explanation of the changes in this version. This is a summary of the biggest changes. As always, a detailed list of every change is provided in
     #{link_to "the changelog", "https://github.com/rubygems/rubygems/blob/3.4/bundler/CHANGELOG.md"}.
 
-  %h3 BIG NEW THING
+  %h3 A new PubGrub based resolver
   .contents
     .bullet
       .description
         %p
-          THE BIG NEW THING DOES COOL NEW STUFF.
+          Bundler now uses
+          = link_to "pub_grub", "https://github.com/jhawthorn/pub_grub"
+          under the hood to resolve versions. The most advance algorithm to
+          approach the version solving problem! 💪
 
+  %h3 Generate gems with Rust extensions
   .contents
     .bullet
       .description
-      Bundler 2.4 also includes:
-      %ul
-        %li SMALL NEW THING FIXES A PROBLEM
+        %p
+          <code>bundle gem</code> now supports Rust! Pass the
+          <code>--ext=rust</code> flag to generate a gem with a Rust extension.
+
+  %h3 Faster git sources in Gemfile
+  .contents
+    .bullet
+      .description
+        %p
+          Git sources in Gemfile now work faster and use less disk space.
+
+  %h3 Old Ruby and RubyGems no longer supported
+  .contents
+    .bullet
+      .description
+        %p
+          Support for Ruby 2.3, 2.4, and 2.5, and RubyGems 2.5, 2.6, and 2.7 has
+          been dropped
+
+  %h3 No more auto-sudo
+  .contents
+    .bullet
+      .description
+        %p
+          Bundler no longer tries to use <code>sudo</code> to upgrade privileges
+          under any circumstances.
+
+  %h3 Other improvements
+  .contents
+    .bullet
+      .description
+        %p
+          Bundler 2.4 also includes other improvements like the <code>bundle
+          lock --update --bundler</code> command to update the locked version of
+          Bundler without having to install gems or the <code>--pre</code> flag
+          to <code>bundle lock</code> and <code>bundle update</code> to
+          explicitly opt-in to prereleases.
+
       = link_to 'Full 2.4 changelog', 'https://github.com/rubygems/rubygems/blob/3.4/bundler/CHANGELOG.md', class: 'btn btn-primary'