I've been waiting for a game like this to come out for years now.
My top expectation for Bethesda's Starfield is for it to be like TES at least as far as choosable species and side quests. Thus, I'm hoping it'll be more like a space opera. Only thing I don't want in practicality is NO EXTRA PLANETS TO TRAVEL TO. It's not No Man's Sky. And the planet shown in the trailer should be central to explore.
Based on what I've seen in the below video, I'm even more hyped. This guy is talking about character creation and playable aliens! And Todd Howard from Bethesda hinted that this will be a core mechanic. Yes, it should have humans as an option. But the other species (five of them?) I can't wait to pick from. RPGs with default human protags backed up by macho voice actors bore me. With the exception of Mass Effect.