As RR Rocks said, the current server is staying as it is. If enough people show interest in a second server, the current one will stay the same but be permanently Creative while the new one will be a fresh Survival world.
EDIT: Important Announcement!
I just checked the prices with my host, they've reduced the prices since I ordered the server but have continued to charge me the old price so long as I have a subscription. A bit sneaky methinks, so I'm going to close the server and reopen it under their new pricing. This means that the server will be closed for a while, and will get a new IP address. Don't worry though, I've backed up the world and it will all be the same as you left it.