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From the release:

“Effective with the release of January 2015 data on February 6, 2015, new population controls will be used in the Current Population Survey (CPS) estimation process. These new controls reflect the annual updating of intercensal population estimates by the U.S. Census Bureau. In accordance with usual practice, historical data will not be revised to incorporate the new
controls; consequently, household survey data for January 2015 will not be directly comparable with data for December 2014 or earlier periods. A table showing the effects of the new controls on the major labor force series will be included in the January 2015 news release.”