add approved UNL announcement

Author: oeggert

blog/2025/rippled-2.4.0.md

@@ -20,9 +20,21 @@ Version 2.4.0 of `rippled`, the reference server implementation of the XRP Ledge
 - `fixFrozenLPTokenTransfer`
 - `fixInvalidTxFlags`
 
-## Additional UNL Announcement
 
-**TODO: Waiting on messaging approval**
+## Notable Updates: New Public Key Provided by the new XRPL Foundation
+
+Following the recent announcement regarding the [move to the new XRPL Foundation](https://xrpl.org/blog/2025/move-to-the-new-xrpl-foundation-commences), the XRPL Foundation members have been working diligently to facilitate a smooth transition of the Unique Node List (UNL) from the old XRPL Foundation to the new XRPL Foundation.
+
+There are two key goals driving this transition:
+- Ensure continued network participation and avoid potential downtime.
+- Allow for a staged migration with minimal impact on validators and node operators.
+
+Keeping these goals in mind, a new subdomain, unl.xrplf.org, has been introduced alongside the existing https://vl.xrplf.org/. This approach allows for a staged migration without modifying the key for the current UNL list. Eventually, vl.xrplf.org will be fully deprecated and replaced by unl.xrplf.org.
+
+In rippled release 2.4.0, the validators-example.txt has been updated to include the new public key published by the new XRPL Foundation. validators-example.txt has been updated to include the new public key published by the new XRPL Foundation. 
+
+Further information on the transition will be shared by the XRPL Foundation in the near future.
+
 
 ## Action Required