As you have assumed, the Survivor Megaways is based on the popular TV show, so it comes as no surprise that the there is a tropical island at the background. The scenery changes for the Tribal Council stage where tribal members get kicked out of the tribe one by one.
As for the symbols you will land, they are represented by Royals and tribal masks in different colours. The survivor logo is the scatter. The male member of the Blue Tribe and the female member of the Red Tribe are the wilds. The Urn is the bonus symbol.
All Megaways slots we have played so far have an extra reel above the main reel set. The Survivor Megaways also have an extra reel, but it moves to the centre of the reel set and splits the grid into two halves. The top half belongs to the red tribe, the bottom part belongs to the blue tribe, respectively.
If an Urn symbol lands on any of the two halves of the reel set, it increases the multiplier of the respective wild symbol (the blue or the red tribal member) as long as the wild is a part of a winning combination.
Land 3 scatters to get 15 free spins. Any additional scatter brings you 5 extra free spins. The active multipliers are carried over to the free spins game and they do not reset after a dead spin.
It seems that Big Time Gaming has done the entertainment aspect right. We will see how trigger-friendly the features would be once the slot goes live on April 15, 2020.