The battle over the literary booty is on its way to Tel Aviv Family Court. The letters currently sit in two bank vaults, though scholars are worried that they aren't being stored properly. They see in the letters a potential treasure map: they may indicate the location of some notebooks confiscated from Kafka by the Gestapo. The issue became a legal matter when the sisters sought to ratify their mother's will, at which point the Israeli government became involved. Esther Hoffe only allowed a handful of researchers to view the letters and didn't make them available to the public -- a sore spot for interested scholars.
Had Kafka's wishes been respected, there would be no problem right now. The letters would have been burned.