DeKalb competed at Piqua in 2006. i'm not sure if they've regularly attended Piqua before then, but they did not compete there in 2005 or 2007.
Milton Union is a smaller Ohio choir that has been around for several years. i don't believe i've heard of the group making finals before, but i haven't heard anything about their show this season.
and finally, ARTS is a new show choir from West Virginia. they competed at Marysville and though i just missed their daytime performance, word from other audience members was that they were quite good for it being their first season in competition. i know they just competed at the Tri-State Invitational and received Third Runner-Up to Hurricane, Piqua and East.