Yah, I got the WoW graphic novel, apparently the hardback I
bought is a compilation of a few books into one. When I went to
look for the rest, it was all thin, paperbacks, and really
expensive. 
Then there's another WoW graphic novel, Ashbringer, already got
a few books out.
I also bought another Warcraft comic (Note: WoW graphic novel
and Warcraft comic, difference) Sunwell Trilogies, the giant 3-in-1
one.
Then again, on the topic of difference. I would think the term
Graphic Novels come from western culture. While comics (manga)
would come from, more primarily the east, Japan.
Also the style of how the book is done.
I have a Halo graphic novel as well, it sure doesn't feel like a
comic because of it's style, and how the story is. Graphic novels'
stories would start in one book, and end in that one. Of course
they'd have sequels and such. It's like watching a movie.
And comic books are like TV serials.
I don't mean graphic novel but the novel itself leh
As in no pictures but text only!