Competitive End of Season Rewards

At the end of season, there is a chest which contains various rewards for your then-current ranking. Various stronghold structures as well as mount for some ranks and even gems.
In the info it is clearly stated that “You can only receive rewards for your current score and not rewards for any lower scores”. That implies of course that if you don’t like the reward of your current ranking at the time the season ends, well, sucks to be you.
I have searched a lot trying to find any information regarding those rewards but to no avail.
People are working towards their rank, they could as well have a sneak peek of the rewards awaiting for them.
We need to have a preview of those rewards, please.