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I would recommend to disallow all writing permissions for the www-data user and use the wp-cli command line tool (http://wp-cli.org/) to update Wordpress yourself (or with a cron job). You can also use wp-cli tool to install themes and plugins. The only times when you need to enable writing for the www-data user is when there is a version update (like from 4.2 to 4.3), otherwise these kinds of upgrades don’t work with wp-cli, but afterwards you can disable writing permission again. On minor version upgrades the command line tool works like a charm.
By doing that, if one of your sites is ever hacked they won’t be able to change any files in the server (like injecting malicious code in php files).
I wrote a blog post with security tips for Wordpress: http://html5hive.org/very-simple-tips-to-protect-your-wordpress-site-from-attacks/