Index: wp-includes/class-wp-theme.php
===================================================================
--- wp-includes/class-wp-theme.php	(revision 30027)
+++ wp-includes/class-wp-theme.php	(working copy)
@@ -310,6 +310,7 @@
 
 	/**
 	 * __isset() magic method for properties formerly returned by current_theme_info()
+	 * Use appropriate method to obtain WP_Theme properties.
 	 */
 	public function __isset( $offset ) {
 		static $properties = array(
@@ -317,13 +318,42 @@
 			'screenshot', 'description', 'author', 'tags', 'theme_root', 'theme_root_uri',
 		);
 
+		_doing_it_wrong( __METHOD__, sprintf( __( 'Please use the appropriate, public WP_Theme method: %s.' ), $this->_deprecated( $offset ) ), '4.1' );
+
 		return in_array( $offset, $properties );
 	}
 
+	/** 
+ 	* Generate appropriate WP_Theme method for _doing_it_wrong notice. 
+ 	*/ 
+ 	private function _deprecated( $offset ) { 
+	 	$properties = array( 
+		 	'name'           => "wp_get_theme()->get('Name')", 
+		 	'title'          => "wp_get_theme()->get('Name')", 
+		 	'version'        => "wp_get_theme()->get('Version')", 
+		 	'parent_theme'   => "wp_get_theme()->parent() ? wp_get_theme()->->parent() : wp_get_theme()->get('Name')", 
+		 	'template_dir'   => "wp_get_theme()->get_template_directory()", 
+		 	'stylesheet_dir' => "wp_get_theme()->get_stylesheet_directory()", 
+		 	'template'       => "wp_get_theme()->get_template()", 
+		 	'stylesheet'     => "wp_get_theme()->get_stylesheet()", 
+		 	'screenshot'     => "wp_get_theme()->get_screenshot()", 
+		  	'description'    => "wp_get_theme()->display('description')", 
+		 	'author'         => "wp_get_theme()->display('author')", 
+		 	'tags'           => "wp_get_theme()->get('Tags')", 
+		 	'theme_root'     => "wp_get_theme()->get_theme_root()", 
+		 	'theme_root_uri' => "wp_get_theme()->get_theme_root_uri()", 
+		 	'default'        => "wp_get_theme()->offsetGet( $offset )", 
+		 	); 
+	 	return isset( $properties[ $offset ] ) ? $properties[ $offset ] : $properties['default']; 
+ 	}
+
 	/**
 	 * __get() magic method for properties formerly returned by current_theme_info()
+	 * Use appropriate method to obtain WP_Theme properties.
 	 */
 	public function __get( $offset ) {
+		_doing_it_wrong( __METHOD__, sprintf( __( 'Please use the appropriate, public WP_Theme method: %s.' ), $this->_deprecated( $offset ) ), '4.2' );
+
 		switch ( $offset ) {
 			case 'name' :
 			case 'title' :
@@ -373,6 +403,8 @@
 	 * Method to implement ArrayAccess for keys formerly returned by get_themes()
 	 */
 	public function offsetExists( $offset ) {
+		_deprecated_function( __METHOD__, sprintf( __( 'Please use the appropriate, public WP_Theme method: %s.' ), $this->_deprecated( $offset ) ), '4.2' );
+
 		static $keys = array(
 			'Name', 'Version', 'Status', 'Title', 'Author', 'Author Name', 'Author URI', 'Description',
 			'Template', 'Stylesheet', 'Template Files', 'Stylesheet Files', 'Template Dir', 'Stylesheet Dir',