[GRASS-user] 2nd edition book?

[infotechsys at pivot.net]

Hi,
I'm thinking about purchasing "Open Source GIS" 
by " Markus Neteler and Helena Mitasova". I notice
that a new edition is coming out next year. Should
I wait for the new edition or go ahead and purchase
the second edition? What is the main differents
in the two edition? While I'm here, can GRASS read
Autocad files? My town uses a company that has 
digitize the town maps using Autocad and I want
to show them a different way of doing it, hoping
to save them some money.
Thanks.
Wayne