Here are the rewards for reaching Bronze III.
I did not play very much so It was only 5 reward chests.
According to https://www.splintercards.com/tool-lootchest.html, my reward chests were estimated to be worth a total of around 365 DEC. I only got around 180.4 DEC worth which was mostly only in potions however.
This was a little bit of a disappointment this season, but hopefully I will be getting more time to play splinterlands and hopefully get to silver+.