Looks like the upcoming Grande Silenzio BluRay will get an audio commentary by Mike Siegel… And a scan of Mikes personal 35mm print which they call the Grindhouse version 
The updated extras are
Bonusmaterial:
Alternatives Ende; Trailer; 20-seitiges Booklet; Audiokommentar von Filmhistoriker Mike Siegel; Grindhouse-Fassung (HD-Abtastung einer seltenen deutschen 35mm Kinokopie von 1969); Filming Silenzio; Promoting Silenzio (ca. 9 Min.); Silenzio in Pictures (ca. 7 Min.); zahlreiche fremdsprachige Bonus-Featurues (OmU);