The first paragraph reads:
The projected museum devoted to Maria Callas will become a permanent exhibit, pending construction of a true exhibit space in Villa Meneghini and provided that the local parish agrees to it. [The parish are] owners of the building, inherited from Giuseppina, the mother of the entrepreneur Giovanni Battista Meneghini, ex-husband of the celebrated soprano.
This sounds to me like the now-typical Italian modus operandi of delay, deferral, and paralysis. (It wasn’t always so!) In any event, the article also offers details about the items to be displayed:
The development was announced… as part of the ceremony during which the Kalos Association turned over to the city the Callas relics acquired with funding from the province at the December 2007 Sotheby’s auction. They include correspondence, notes, personal documents, bills, photographs, newspaper articles, and two dresses worn by the operatic superstar: a pink kaftan and a chocolate-colored day dress crafted by Biki, the soprano’s favorite Milanese couturière.