This may be an indication of what is exercising Anthony Watts' mind: Ronald Bailey at Reason Magazine is reporting a rumour that the BEST project will next week report a 1.5°C temperature rise since 1750.
The rumors say that new BEST reanalysis will show that global average temperature has increased by 1.5 degrees Celsius since pre-industrial times and will suggest that most of the warming since the 1950s is the result of increased greenhouse gas concentrations in the atmosphere.