While we currently do not know anything about the upcoming Season 4, some assets from the 1.4 client hint at a theme centered around Iron Wolves.
As initially reported by diablo4.live, an asset named 2DUI_Seasonal_Reputation_UI contains what looks like a Season 4 badge, which features Iron Wolves.
There is also another minimap icon very similar to the Iron Wolves badge.
The third asset found in the game files is this Iron Wolves emblem.
Players on the PTR have also noticed some enemies grant reputation with the Wolf’s Honor, so we anticipate a similar reputation system to previous seasons.
We will need to wait until another campfire chat to learn more about the mysterious Iron Wolves!