I am in the process of migrating from MailChimp API 2.0 to 3.0
One of the features I used in 2.0 was to retrieve the HTML source from a template https://apidocs.mailchimp.com/api/2.0/templates/info.php so I could preview how a proposed email would look, without having to create a campaign first.
There doesn’t appear to be a way to do this with API 3.0
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Answer
I just answered this question over here – mailchimp 3.0 Get template in html form
There’s no direct way of getting the source of a template (yet), but you can create a campaign with your templates and then get the source of that campaign.
http://developer.mailchimp.com/documentation/mailchimp/reference/campaigns/content/