Well, it can't come too soon!
Petrus reports that the Holy Father has directed CDF to prepare an instruction for bishops on how to proceed with cases of alleged Marian apparitions and other alleged mystical phenomena.
The first step is to impose silence on the alleged visionary. And that step by itself is half the battle, because stopping the publicity associated with false mysticism limits the damage and confusion it can cause. Also, when false seers disobey such directives, they make the bishop's job in identifying them much easier!
A rough English version of the article is available on-line as well.