So shadowcursed lands are act two? Interesting, becasue in EA it seemed as though we were meant to be choosing between it and the underdark as the routes to moonrise tower. I wonder if that was the case when EA first came out but along the way they made the shadowlands in their entirety act two? It doesn't make a difference to anything but it's intereting to think about. Also interesting from a story structure level. Act 2 in a story is typically the longest act and the part where most of the action takes place, with act three beingwhere everything wraps up. But based on what we've heard, being in the city is going to be the biggest part of the game. So I wonder how that will play out in terms of experiencing the story and how the pacing feels.
Also there are places that teleport you to other planes/locations.
If you are referring to what Wolfheart said then he made the other planes comment in relation to the 'mystery' location which you would never have dreamt of and was very, very far from BG but NOT on on another plane. This is the place mentioned by The Red Queen.
Wasn't it the... you know... dino place? (I don't know how to do spoiler tags here...) I think Wolfheart simply didn't read the article offhandedly confirming we could go there.
