Unusual notation in my chess book (ex 6.e5!?N)

I just bought a new chess book - The Sicilian Defence by Lubomir Ftacnik (Grandmaster Repertoire #6). Throughout the book some moves are notated with a "N". The symbol is not defined in the page with the symbols key, nor does it refer to a "Note" or otherwise explained. I would appreciate any answers on this because it is like a brain itch that doesn't go away (is it a good move, bad move, the opponent frowns in dismay when you play the move?) Examples below

(pg 11) "This seems like the most natural move. 5.Bb5 Nf6 6.e5!?N"  What does the "N" stand for?

or this (pg 11) "This position was reach in Papa - Wirthensohn, Switzerland 2007, and here I suggest 10... Nb4N 11.Bb1 Na6 12.Bc5 b6 with roughly equal chances."

Novelty I believe.

Edit:

http://en.wikipedia.org/wiki/Algebraic_notation_(chess) under Annotation symbols has -

• TN or N   (a theoretical novelty)

Yes, WhitePawn is correct. "N" is the international symbol for a new move, or Novelty.

Meaning a move that, as far as the author knew, had not been played or written about before.