The seventh book and the final installment in the Harry Potter series.It will feature the final adventures of Harry Potter as he attempts to bring an end to his nemesis, Lord Voldemort.In this book Harry will be looking for the remaining horcruxes and it is unknown if he will return to Hogwarts.
Hallow means " to Make something holy or have great respect for something" SO Hallow could refere to the Horcruxes.
Known plot details are :
* Harry returns to the home of his non-magical (Muggle) relatives, the Dursleys, during the summer. The magical protection which Albus Dumbledore arranged, that requires Harry to have a home with his surviving family, is set to expire on Harry's 17th birthday July 31.HP6

* Harry comes of age (for wizards) when he turns 17, and is therefore entitled to perform magic outside of school and to obtain a licence to Apparate. His friends Ron Weasley and Hermione Granger, and many of his classmates, already turned 17 during the sixth year, and Neville Longbottom turns 17 on July 30th — one day before Harry.4

* Harry plans to visit Godric's Hollow, and Ron Weasley and Hermione Granger plan on accompanying him on this trip, providing the jumping off point from where they will start the search to destroy the remaining Horcruxes.HP6

* There is expected to be a continuing relation...

The final book in the Harry Potter series in which it all comes down to the final battle between Harry Potter and Voldy. highly recomended.

The end of your childhood.

The 7th and final book in the Harry Potter series. The title was announced on J.K. Rowling’s site on December 21st, and all Harry Potter fans celebrated and had a major Sqeeeeee moment. There are so many theories out there, but as of right now, little is known about the book. I just hope Harry lives and marries Ginny.