There were no specific details about what we should expect but that just means we’ll have to discover all the new content on our own.
In the announcement, tinyBuild revealed that Dynamic Pixels has added tons of new features for players to explore. tinyBuild Expect New Content in the alpha 4 There are new conspiracies to unravel in the alpha 4 Sneak into your neighbor's house in #HelloNeighbor - a Stealth Horror game w/ advanced AI. It’s also the closest we'll get to the final version of your surly neighbor’s home in all of the alphas thus far.
In the upcoming update, players will be able to experience a larger house filled with more puzzles to solve and secrets to uncover. The Hello Neighbor alpha 4 was announced by tinyBuild Games today and will be available to people with Early Access to the game starting on May 4th.