A preview of what the new 1.7 survival map will be like...
(If only we got aurora sky lighting effects at the border edge)
Out of all the seeds I did check seemed like the better one, it may still change and I will post an update if it does (though highly unlikely.)
It will have a world border of around ~9000 to start with, much the like current 1.6 survival map. The 1.7 survival map will just be a new map that is linked with the existing survival inventory worlds/economy for you to goto.
There will not be a towny, protected area, home spawn or economy money reset for this update!