This is a sad mess indeed, but they are just about to build the last A300 after a run of 30 odd years, so in the end 12 months wont seem too bad.
From the little I have heard from someone at EADS, there have been some major issues involving IT at the design stages, that have caused some very expensive, in terms of time & money, problems. Not just cabin wiring.
I hope we will be able to look back at this as a glitch in an otherwise successful program.