Question about upcoming Game of Thrones 5

[Chronicles of Sasuke]

So when it comes out will all episodes be available at once or we need to wait some time for each next episode ?

 

[Ōkami]

It'll be once a week probably.

 

[IndraGripen]

Spoiler*

One popular character will die in the movie series, but not in the book.

 

[Caliburn]

Why would they release all the episodes at once