And former contestant Joel Dommett, who came second in 2016, thinks the change will make it much more difficult for 2020 campmates.
"I think it would be really tough. They are guinea pigs," he exclusively told Digital Spy. "I went in and there had already been 16 casts in before me and you kind of knew to a certain degree what to expect.
"This year, there's no idea what to expect, and you know because it's different, they are going to throw everything, including the kitchen sink at them.
"It will be absolutely mad, I am so excited about this and I haven't been this excited about anything for a while. I think it's going to be huge. I can't wait to watch it going, 'oh and it's that cold there as it is for us here'.
"I think we can feel a bit more sorry for them, it's going to be really cold, they are going to be really hungry and the Welsh countryside can be very unforgiving. I assume there will be heights, caves, and zip-lines involved. They won't allow it to be 'oh that's fine', they are going to really go for it."
Joel continued with saying the Australian weather can make such a difference to the contestants, adding: "There's moments where you are really hungry, smell terrible, miss your family, and then there's just a glimmer of sun through the trees and that moment would give you life.
"Take that away and it's going to be really tough. When it rains, it does really break people, I feel for them but the beauty of the show is the more it breaks people down, the more you get out of it. I think they will really bond."
The presenter also spoke about his ITV2 show Hey Tracey! returning for a second series, where celebrities have to use a virtual assistant to find answers to ridiculous questions to win money for contestants.
As one of the first shows to return to filming after lockdown, Joel said: "The only thing it affected is you can't hug someone if they win. If someone wins money, all I want to do is hug them, but there is something funny about people jumping 2m apart but together.
"Everyone was just so happy to be out of lockdown so it was really mad just to be out of the house and you can just feel everyone being so happy. We were so excited. It was so good."
Hey Tracey! starts Monday 5th October at 10pm on ITV2.
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