The plug is indeed included.

I expect the 9 mile AER option is just the beginning of Toyota's assault on the PHEV market, prob 20 miles soon after that, then 30, then 50... then, er, what's the name of that smelly stuff that goes in the fuel tank again? Was it, gazooleen or something??

http://mysite.wanadoo-members.co.uk/ecotech/ecot.htm