Today's New York Times correspondent gives us the background quite concisely :

"Franz Kafka’s final wish before his death in 1924 — that his papers be burned — was famously defied by his friend, the writer Max Brod. The world got “The Trial,” “The Castle” and the adjective Kafkaesque; Mr. Brod got the papers. When Mr. Brod fled to Tel Aviv from Prague on the last train out in 1939 as the Nazis rolled in, he had with him a suitcase full of Kafka’s documents. Here, he took up with his secretary, and when he died in 1968, he bequeathed to her the remaining Kafka papers, as well as his own from a rich cultural career. For nearly 40 years, the secretary, Esther Hoffe, held the world of Kafka scholarship on tenterhooks, keeping the documents in her ground-floor apartment on Spinoza Street, some of them piled high on her desk (it was originally Mr. Brod’s), where she typed all day and took her meals. The last time a scholar was permitted into the apartment was in the 1980s. Later, Ms. Hoffe sold the manuscript for “The Trial” for $2 million. No one knows what remains. Since her death last year at age 101, her 74-year-old daughter, Hava, has indicated that a decision about the coveted papers will be made in the coming months. While most of the Kafka estate is already in archives in the Czech Republic, Britain and Germany, some may still be inside the scuffed front door of the Hoffe" apartment.  http://www.nytimes.com/2008/08/18/world/18kafka.html?hp

This story had appeared on the BBC in July 2008 who referred to "hidden papers"...."locked away"...."gathering dust".........."which no human eye had seen"........& then topped it all off with the qualification
"it is unclear if the fragile papers remain legible after so many years".

 http://news.bbc.co.uk/2/hi/entertainment/7498824.stm

if indeed they had existed in the first place.

________________________

Tomorrows Hare'etz the Israel centre leftish newspaper carries a story entitled "'Kafka's lifelong dream was to make aliyah" and describes "the recent discovery of some of Franz Kafka's writings in a Tel Aviv apartment" which moreover "have prompted a resurgence of speculation into the writer's connection to his Jewish heritage and his allegiance to Zionism". Kafka scholar Mark Gelber, a professor at Ben Gurion University told New York Times that the writer's "intimate connections to Zionism and Jews" was among the prime reasons his lost writings should remain in Israel. "This material belongs in Jerusalem," he was quoted as saying. "Brod became a Zionist before the First World War, lived and worked here and is buried here. Less well known is the fact that Kafka was a totally engaged Jewish personality and writer with many intimate connections to Zionism and Jews." But in his new book, "The Tremendous World I Have Inside My Head: Franz Kafka: A Biographical Essay," Louis Begley posits that despite the writer's preoccupation with his Jewish identity, he was neither a Zionist nor an active member of the Jewish community. "I admire Zionism and am nauseated by it," Mr. Begley quotes from Kafka."  http://www.haaretz.com/hasen/spages/1012756.html

________________________

Yet according to other witnesses of unseen material such as the Oxford academic James Hawes who has a doctorate on not only Kafka but Nietsche as well & as such is very employable and well educated in teenage intellectual angst, the Kafka archive will only prove an addiction to hard pornography or if not "h-a-r-d" (in our best modern sense) the less than glossy pages of "Amethyst" and "Opale" magazine which both Kafka and Brod were known to collect and subscribe to, which had illustrations of naked people with ample body hair "going @ it hammer and tongs".

Of course many people were upset by that.
 http://www.guardian.co.uk/books/2008/aug/15/franzkafka.germany
body hair is a very sensitive subject even now.
________________________

Perhaps the papers will not only be difficult to read but will be stuck together too.., .

 http://en.wikipedia.org/wiki/Kafka