On Thursday, June 20th Apple announced that it would be starting a voluntary recall for all 15 inch MacBook Pros sold between September 2015 and February 2017. The recall follows over 30 reports about the laptops battery overheating causing damages to the laptop and other property. There are also several reports of burns and smoke inhalation caused by batteries overheating or exploding.
It is estimated that over 430,000 laptops were sold in the US alone that could potentially suffer from the issue. Officially if your serial number is on the list of affected units you should stop using your MacBook immediately and seek a replacement through either an Apple store, an authorized Apple service provider, or contact Apple Support. Currently the replacement process has the device sent to an Apple Repair Center for inspection and verification for eligibility for replacement which can take anywhere from 1-2 weeks. Apple has stated that "This worldwide Apple program doesn't extend the standard warranty coverage of the 15-inch MacBook Pro."
In order to check to see if your MacBook might suffer from this issue first check to see which 15-inch MacBook Pro model you have. Simply click on About This Mac from the Apple Menu, Affected models will be labeled as "MacBook Pro (Retina, 15-inch, Mid 2015)." Click this link to check your serial number for eligibility.