The Gulf Study Four Years after the Deepwater Horizon Oil Spill:
The National Institute of Environmental Health Sciences (NIEHS) Gulf Long-term Follow-up Study (GuLF) is a long term health study with over 100,000 participants composed of oil spill cleanup workers and volunteers who responded to the April 2010 explosion of the Deepwater Horizon oil rig in the Gulf of Mexico. The NIEHS held a teleconference on April 11th to update members of the media, the public and study participants on the progress of the study. This post provides a summary of the call, including a review of progress made and preliminary observations. Go to: http://www.niehs.nih.gov/news/newsletter/2014/5/spotlight-gulf/index.htm
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UPDATE: See the comment section for an additional recommended source of information.
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One more source of information about the general recovery from the major spill incident is this recent CRS report.
Recovery Diva 
For those interested in the recovery, Dave Butler and Ward Sayre from the University of Southern Mississippi wrote a very comprehensive report. This was a follow-on to their excellent look at the recovery from Katrina. One of the most important conclusions was that the players involved, and their relationships, were quite different even though many of the same communities were affected. Anyone interested, feel free to contact either the authors or me.