The main new feature is a Server Browser, making multiplayer a whole lot more accessible. Select Multiplayer, then click Browse to see a list of any games currently being hosted. You no longer need to forward a port unless other players are connecting to the host directly (i.e. outside of the Server Browser).
Do note that for the best experience, the host will want to have good internet upload speed - we are continuously working on network optimizations, but if a game has above six players, lag may increase.
Give it a go and report any bugs or suggestions in our Community Discord: https://discord.gg/rRtM3Av