I'm worried this is just going to be another survival/base builder. The trailer didn't show much in the way of actual things to do outside of that.

If I had to guess, the world is going to be empty and become populated by the things people build... which seems unlikely to result in particularly enticing gameplay. Guess we'll see

Based on Hello Games' typical MO, they want people to be able to leave their marks on the world and interact through shared events that further some goal as each person does things semi-independently of others.