not sure what the kit will come with but some things that are less obvious:
rolling pin and large plastic zip lock bags for crushing specialty grain if the kit uses it.
lots of ice, i have 2 dozen 1/2 liter water bottles i freeze.
good measuring tools, thermometer (something better than the turkey fryer type), big measuring cup, hydrometer, medicine dropper (for sanitizer) and a note book to write down everything your measure as well as dates and other details.
clean trash barrel or the cheap large plastic buckets with the rope handles are good for a water bath to help control fermentation temps if its warm in your area.
extra pot to boil water and/or preboiled water.
big funnel with a screen and/or an auto siphon.
big smooth plastic spoon for stirring.
star san or iodiphor (star san costs a bit more but it doesnt stain things and also helps cleaning)
oxiclean free (regular oxi clean has fragrance in it)
turkey baster or something similar for taking samples from fermenter for measuring and tasting.
an extra packet of dry yeast just in case.
lots of beer in brown bottles of your choice. you only got 3 weeks to come up with 50 or so bottles.