Update release date

Author: Amar3tto

CHANGES.md

@@ -91,7 +91,7 @@
 
 * ([#X](https://github.com/apache/beam/issues/X)).
 
-# [2.70.0] - Unreleased
+# [2.70.0] - 2025-12-16
 
 ## Highlights
 

website/www/site/content/en/blog/beam-2.70.0.md

@@ -1,6 +1,6 @@
 ---
 title:  "Apache Beam 2.70.0"
-date:   2025-12-?? 15:00:00 -0500
+date:   2025-12-16 15:00:00 -0500
 categories:
   - blog
   - release
@@ -21,7 +21,7 @@ limitations under the License.
 
 We are happy to present the new 2.70.0 release of Beam.
 This release includes both improvements and new functionality.
-See the [download page](/get-started/downloads/#2700-2025-12-??) for this release.
+See the [download page](/get-started/downloads/#2700-2025-12-16) for this release.
 
 <!--more-->
 

website/www/site/content/en/get-started/downloads.md

@@ -95,7 +95,7 @@ versions denoted `0.x.y`.
 
 ### Current release
 
-#### 2.70.0 (2025-12-??)
+#### 2.70.0 (2025-12-16)
 
 Official [source code download](https://www.apache.org/dyn/closer.lua/beam/2.70.0/apache-beam-2.70.0-source-release.zip).
 [SHA-512](https://downloads.apache.org/beam/2.70.0/apache-beam-2.70.0-source-release.zip.sha512).