Francisco José Fernández de la Cigoña, author of the most widely read Spanish Catholic blog "La Cigüeña de la Torre" claims that on the desk of the Pope there is a decree revoking the excommunications of the four bishops consecrated by Archbishop Lefebvre in 1988, based on lacking/reduced culpability pursuant to can. 1323, para. 4 and 7, and can. 1324, para 1, 3 and 8 of the Code of Canon Law. The only thing that would be necessary according to Mr Fernández de la Cigoña would be a humble petition by the bishops concerned alleging that they in good faith presumed a state of necessity, an argument which the Society of St. Pius X has advanced for a long time.
While this clearly is but a rumour, and should be taken as such, and as surprising as it may seem, I will note that Mr Fernández de la Cigoña has remarkably often been correct when making such statements.