The latest Avengers War Table showed off what you expect in the Beta on Avengers. As we reported a while a go the beta dates this footage showed off what to expect. The beta is coming to Xbox, PlayStation and PC. There is no beta for Stadia.
The beta will allow you try out various aspects of the game and get a feel of what to expect. The 4k War Table is above and you can check out the footage.
Thank you to Chris for alerting me to the fact that Stadia is not included in the beta.