Next year's event will be held slightly earlier, from March 8 to March 16, and before entries opened there had been a surge of interest, with competitors contacting organisers concerned about the availability of places.
The 2012 event, held over a week, traversed about 500km from Milford Sound to Queenstown. It was won by Team Seagate, comprising Nathan Fa'avae, Sophie Hart, Chris Fome and Trevor Voyce, who finished the race in 87 hours.
Co-race director Warren Bates said he was delighted with the excitement and feedback the inaugural race had generated.
"The dream of racing through New Zealand's wilderness and mountains is now a reality for all and everyone seems to be buzzing about it.
"The return of true expedition racing here has been welcomed everywhere and I've spent a lot of time over the last few weeks assuring teams, many of whom became addicted to the race's live coverage website, that we will do our best to cater for all."
GodZone had been developed to take in the scenic beauty and outstanding mountainous areas of the lower South Island, with the course remaining a tightly guarded secret until the day before the race.
Despite more than nine months until the 2013 race, Mr Bates said the course for "GodZone Chapter Two" was largely complete.
"It might seem pretty early to some but we were determined to get out before the winter snows to make sure we had something truly spectacular lined up for the teams.
"I can't say too much about the course but it's fair to say that it's more technical than Chapter One, just as beautiful and will be an incredible achievement for those who get to the finish."
The aim of the adventure race was for teams of four to get from start to finish using a map and compass to navigate through a series of checkpoints and transition areas over several days and nights.
No support crews were allowed on course so competitors relied on themselves and the race organisers to survive.
"One major change that we've made to the event this time is to increase the race duration by an extra day to six and a-half days," Mr Bates said.
"GodZone represents the ultimate challenge for the expedition athlete and we are not going to water it down.
However, we're keen to ensure as many teams as possible have a fighting chance of getting to that finish line and that extra 24 hours can make all the difference.
"We still expect the fastest team to complete the event in three to four days."
