Well, Dorney normally puts in a new coaster every four years, so I'll cheat and say for 2016, a GCI. Or GravityGroup. Just SOME wooden coaster. Dorney has to be one of the only parks in Cedar Fair's lineup without a GCI or modern wooden coaster. I don' care if it's good or not, but a non-recycled coaster would be great.
For 2015... hmm. There's not anything realistic to suggest that Dorney needs. The old bumper cars would be nice to have again.