This is the latest I saw and it should be the final language that was approved. Page 904 or search for 1895m.
Here is the language, and while the "may be" terminology for using an external source is weaselly, the "not less than 4 kilowatt hours" is definitive and is specific to include the Prius Plug-in and "above". This is clearly written with the petroleum suppliers in mind. Anything that dares to not use petroleum should be punished:
b. “Hybrid electric vehicle” means a vehicle that is capable of using gasoline,
diesel fuel, or alternative fuel to propel the vehicle but that is propelled to a
significant extent by an electric motor that draws electricity from a battery that has
a capacity of not less than 4 kilowatt hours and may be capable of being recharged
from an external source of electricity.
B