Rorate Caeli

An Instruction for a stable group of Exorcists in each diocese?

Maybe, according to the Italian religious news website Petrus:
...Benedict XVI ... would intend to providentially deal [with the problem of diabolic forces] with an instruction, which could be published in the first months of the next year, that would determine that Diocesan Bishops... all over the world confer the mandate to perform exorcisms on a stable number of their priests. There have not been official confimations by the Vatican, being just a rumor for the moment.