Feedburner subscription gives Drupal role

It would be interesting to have following feature.

If user subscribed on certain Feedburner feed by e-mail he/she is given a certain Drupal role.

Usecase:
I have a site where I want people to subscribe on news by e-mail. I use Feedburner for that. To bost the subscription I have some hidden content on the site that become visible only after person subscribed on site news using Feedburner. To implement that I need feature mentioned above. Any hope to get it? :)