This is interesting, because I was also wondering about the Primo de Rivera dukedom. It was in fact created in 1948, so according to your news it will also vanish now with this expected law? I did a little reading on the family - although the original duke was also the founder of the Falange movement, on the other hand his grandson was actually an important ally of Juan Carlos in the period of transition to a parliamentary democracy. So - a sad final outcome for the present duke if he is included in this loss of title (although he continues as Marques de Estella, yes?)