Venus I'm hyped as all hell for, it looks amazeballs. So long as essential stuff isn't gated behind super long faction grind again, I'm excited. (Gathering Murk livers is currently driving me mad, to the point where I'm trying to progress in the Earth faction just to get the bait for them, so I can build the amp that'll let me Eidolon hunt more effectively, which is what I want to do in the first place right now)
Railjack on the other hand I'm biting my nails over. It will either be beyond amazing, or it will tank harder than a Rino with Ironskin up. I don't see much in-between possible. Here's hoping there's some neat variety in Railjack missions, and that they're worthy of late-game content.
Honestly, though, The New War has me the most intrigued. Seriously, I don't cry for media at all, but The Sacrifice came reeaaaallly close to making that happen. It was beautiful, and now I'm insanely hyped to see where the story will go next.