Margie was running in the Halloween Test this afternoon — in addition to the normal trick-or-treat doors and inspirations and costume bits (toward an extra costume slot), etc., this year you can pick up …
Real costumes. Toggleable temp “powers” that give you the appearance of several of the groups running around Paragon and the Rogue Isles. Lost, Freaks, Council, PPD, Paragon Protectors, etc. Fun stuff. The costume, when turned on, simply substitutes for your form (though you can still use all your powers — watching a Freak Boss run around with a broadsword and fly through the air was … disturbing).
The costumes don’t work in PvP zones (to avoid griefing — though, to be honest, I think that’s a perfectly legit use of such a power), and they have a 17 day timer, real-time, so they should all be gone by Thanksgiving. Fun stuff.