These are the upcoming changes from Facebook due July 2nd.
Ads API Breaking Changes. The table of contents are linked below.
Due July 2nd, 2014 at 10am PDT
Table of Contents
Ad Campaign Object
Ad Set Object
CPA for Link Click only allowed for page posts
CPM and CPA for link click conversion spec requires post_id
Deprecate page_story, post_story, and app_story specs
Only allow one conversion spec for oCPM ads
When deleting a custom audience with lookalikes, error will be thrown
Remove origin_audience_id and origin_audience_name
Ad previews API: deprecate the page_type field for preview in favor of ad_format
Reachestimate API: remove imp_estimates