To celebrate the game's 4th year, a generous amount of new content has arrived! Big shows now take place in a larger new "Epic Arena", which features a ramp & stage with video screens. What takes place in that arena also now includes a handful of stipulations that have never been seen in a wrestling game before - from ropes & chains to water! Less dramatic changes include forbidding strikes or grapples if you want an unusual challenge. All of these are explained in new promos whenever they occur in career mode.
Modders should also be aware that the launcher has evolved to give you greater control over the growing amount of content. It assumes you have the .NET6 runtime, so you may want to grab that from Microsoft if you're running an older version of Windows.