New hook ParserBeforeTranscludeTemplate:

This hook allows for modification of the title and text of a template which is being transcluded.

Use of this hook will allow extensions to create features such as TransWiki for an alternative to ScaryTransclusions.

RELEASE-NOTES

@@ -179,7 +179,10 @@ it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
 * Added blank special page Special:BlankPage for benchmarking, etc.
 * Foreign repo file descriptions and thumbnails are now cached.
 * (bug 11732) Allow localisation of edit button images
- 
+* New hook ParserBeforeTranscludeTemplate to allow extensions to modify the text
+  and title of a template being transcluded in a way similar to how
+  ParserBeforeStrip effects the page being parsed
+
 === Bug fixes in 1.13 ===
 
 * (bug 10677) Add link to the file description page on the shared repository

docs/hooks.txt

@@ -921,6 +921,12 @@ $parser: parser object
 $text: text being parsed
 $stripState: stripState used (object)
 
+'ParserBeforeTranscludeTemplate': Allows modification of the text and title of a
+  template which is being transcluded
+&$parser: parser object
+&$text: text being transcluded
+&$title: title object of the template
+
 'ParserBeforeTidy': called before tidy and custom tags replacements
 $parser: Parser object being used 
 $text: actual text

includes/parser/Parser.php

@@ -3039,6 +3039,8 @@ class Parser
 		// Cache miss, go to the database
 		list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
 
+		wfRunHooks( 'ParserBeforeTranscludeTemplate', array( &$parser, &$text, &$title ) );
+
 		if ( $text === false ) {
 			$this->mTplDomCache[$titleText] = false;
 			return array( false, $title );