I also was wondering this too but figured it will be for later updates on new fish/types/etc. I am excited to see what they have in mind and hope they include that lava type of fish too, would be cool to see. Maybe it will require special tank/fishing line to catch? We shall see :)
Actually never mind i caught my first Large Keeper yesterday and it was a big Sun Ray fish... confirmed there is usage atm, but rare :) good luck and happy fishing!
