Within the next several weeks, all Landsat 8 data that have been acquired since achieving WRS-2 operational orbit will be reprocessed using updated calibration parameters for OLI and TIRS data. During this time, all online products will be purged and the online inventory will be re-populated.
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