It includes four colormaps: viridis, plasma, inferno and magma. Examples of these colormaps can be seen here. You can use them in gnuplot by adding the following line to your script: load 'plasma.plt' ...
{'LookupTables': [{'Name': 'matplotlib_gnuplot', 'AlphaValues': [0.0, 1.0, 1.0, 1.0], 'ColorValues': [0.0, 0.0, 0.0, 0.0, 0.1, 0.3176470588235294, 0.0, 0. ...