Temporyal confirms there are no signs of content beyond Season 5.

This was expected.

Anyways, why would they continue working on a game when the community incessantly complains and trashes it? No matter how much work they've put into reworking all of the base maps, bringing a class system back, and significant balance changes... the players continue to cry about everything no matter how small (and personally attack the devs, too).

You get what you deserve.