Magical maladies and mayhem? A fried food feast? A clash of colliding colors?

Personally I think a more traditional Halloween event would be good but I guess we will see what they do. As for Magical Maladies & Mayhem it sounds to me more likely to be based off I've Grown a Costume to your face or maybe Hex and the City. Possibly the Island of Dr. Hibbert but I see the first 2 as far more likely. So I don't see it centering around Springwart's.
This is assuming of course they are not pulling our leg with Magical Maladies & Mayhem. We are still waiting on those Bow Wielding Gnomes to invade Springfield that they mentioned earlier this year. :p At any rate I believe there is a good chance costumes will be back and used in the event.