I've heard that the Trilogy is "over."
Apparently, Mr.Paolini was thinking about the third book that he was going to write and realized it was much too big to be put into just one book, so he has decided to split the last book into two separate books. Thus, it can now be considered a series, or as he calls it "The Inheritance Cycle".
And for those of you who would like it in detail, I copied this from another guild I am in. This came from a newsletter the person had signed up to receive directly from the Inheritance site::
Alagaesia Newsletter
It was announced today that the Inheritance Trilogy is the Inheritance Trilogy no more - a forth, full-length novel has been added to the Trilogy, expanding Eragon and Saphira's adventures.
"I plotted out the Inheritance series as a trilogy nine years ago, when I was fifteen. At that time, I never imagined I’d write all three books, much less that they would be published" said Paolini. "When I finally delved into Book Three, it soon became obvious that the remainder of the story was far too big to fit in one volume. Having spent so long thinking about the series as a trilogy, it was difficult for me to realize that, in order to be true to my characters and to address all of the plot points and unanswered questions Eragon and Eldest raised, I needed to split the end of the series into two books."
In addition to the announcement of a fourth book in the series, the release date has been announced for the third book, which still remains un-named: September 23, 2008.
Keep checking back on Shur'tugal as we update with even more information regarding Book 3, Book 4, and more! Also, be sure to check back on Shur'tugal and Alagaesia at 5 PM EST for a video announcement from Christopher Paolini!
That was a shock to me, and I've heard a lot of people are upset about it. They didn't expect to be waiting that long.
But concerning the unnamed, it's already been released, so yes.