HI EVERYONE WHO KNOWS AUTOCAD 2013 RELEASE BECAUSE OUR COMPANY BUY THIS STUFF......................

I'd read the user manuals that you can find in :
C:\Program Files\AutoCAD 2013\Setup\Docs with a name like : acad_acr.pdf or find all the PDF files in : C:\Program Files\AutoCAD 2013
Or have an official or unofficial trainning curse.........
 

The initial reviews are already out.  Find one and read it.  More information will begin to trickle out soon.  Ralph Grabowski usually puts out an ebook before AutoDesk ships a new release with explanations of all the new features.  You can also check the blog at JTB World.

Several links on the upcoming version follow:
 
Autodesk Japan release information (Google translation)blog nauseam AutoCAD 2013 – What’s new? - future posts in category AutoCAD 2013CAD-a-Blog AutoCAD 2013 is Announced in Japan!Lynn Allen AutoCAD 2013 is approaching the Finish Line
 
If it's books on the 2013 version you're after you'll have to wait... they won't start to hit the shelves (electronic or otherwise) until after the new product ships.
 
Dave.