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This suggests it is so, which would also scupper my plans to use 4700 with a MTB/non-dyn-sys rear mech, unless the new road pull ratio also happens to be the same as dyn-sys now, but that seems like it would be far too much of a happy coincidence.
edit: a bit more poking around suggests that 4700 does indeed have the same cable pull as 5800, meaning it's not suitable for MTB component hybrid setups.
Polygon
Cannot confirm if the 4700 rear derailleur have the same cable pull as 5800 et all.