So they are not excommunicated if,and only if, they return to the Church? Or is this a blanket good faith gesture. I must proclaim my ignorance on this subject.
They will, no doubt, wish to return as "Fr. So-and-so" or even perhaps "Bishop So-and-so" ... that part, the actual exercise of legitimate ecclesiastical authority, will require some negotiations. What form said negotiations may take, remains to be seen ... Benedict is Pope (and I'm not), so I'll let him do his job.