How to cleanup Wordpress media tags after migration?
Ah found the answer after some digging:


  You have the Media module enabled, so the migration renders image references as media tags - you need to change your filter to interpret the tags


http://drupal.org/node/1859458#comment-6819442


  You have the Media module enabled, correct? And you're saying when you view (not edit) the nodes you're seeing the media embeds ([[{"type":"media"," etc.) instead of the image itself? Please go to /admin/config/content/formats and make sure that the text format you've chosen for the imported bodies has "Convert Media tags to markup" enabled.


http://drupal.org/node/1642352#comment-6136596


http://drupal.org/project/media