Have a look here
http://www.users.on.net/~jscones/GWX/
Watch the GWX trailer
Check out some screenshots
And of couse have a look through the manual online
http://mysite.orange.co.uk/manual/GW...NUAL_EN_PF.pdf
More ships
More aircraft
More theatres of operation
More flotillas
Allied AI subs
Etc etc