Details about the reprocessing effort and expected duration will be posted to the USGS Landsat website (http://landsat.usgs.gov) when they become available.
Please contact USGS with any questions.
To contact the Landsat Project the email address is: landsat@usgs.gov
Source: USGS Landsat Program

Above the Earth, Below the Surface: Landsat’s Role in Monitoring Water Quality
Safeguarding freshwater resources is crucial, and while scientists use a variety of ground-based techniques to gauge water quality, the Landsat program has provided water quality data from orbit for decades.