Sounds like it’s more than just frequent balance patches, but maybe they’re gonna take a systematic approach?
If I had to take a real guess I’d say hero tickets or something along those lines… you can only use a hero for a certain number of lives per round, and maybe they have a CD on them.
This would not only force players to think more strategically about their hero picks on different points/parts of maps but also to use a wider array of heroes.