'Malware details' and 'fetch as Googlebot' have been released in Google Webmaster Tools Labs.
Sometimes finding the malicious code is extremely difficult, even when you do know which pages it was found on. Google will be providing snippets of code that exist on some of those pages that it considers to be malicious. This enables you to eliminate the malware on your site very quickly, and reduces the number of iterations many webmasters go through during the review process.
Fetch as Googlebot
"What does Googlebot see when it accesses my page?" is a common question webmasters ask. This feature will help users a great deal when they re-implement their site with a new technology stack, find out that some of their pages have been hacked, or want to understand why they're not ranking for specific keywords.