With Episode III coming out on DVD just a day after, and with the fond memories of wild costumes and lightsaber fights at work when the OT came out last year, I believe I'll be getting two days of use out of a Palpatine mask, custom robes, and a Force F/X lightsaber.
And yes, there will also be trick or treating. I'll stop doing it when they stop giving me candy. And I've found there aren't many willing to say no to a 6'7 black man holding a Jedi weapon.