As can be seen, the Brawn tribe buff is a red and orange design that contains images of a tiger. The Beauty tribe buff is a yellow and purple design that includes images of a snake. The Brains Tribe buff has yet to be discovered but is a blue and green design that features images of a crocodile.
Totang (Brawn Tribe)
Gondol (Beauty Tribe)
Inside Survivor is currently seeking further confirmation on the legitimacy of these photos.
UPDATE: As a few of our commenters have pointed out, there are a couple of minor mistakes on these buff designs when compared to the ones seen in the season preview. These are just very well made fakes, although probably very close to the actual designs.
Picture courtesy of @Idol_Thoughts on Twitter.
For more information on the new season, you can check out the entire cast and their bios here. Inside Survivor also revealed the tribe names and divisions back in June and recently posted about the new idol twist.