Worth remembering that while the tower and all the other bits scattered across the landscape are new to us the npc's have been living with them for five years now. There's only so long they can go "woah! What's that?" before they get used to it being there.
We've been promised more storyline for 2.1 and 1.5 times as much again for 2.2 a few months later. The story needs to develop, we can't just have it go bosh and land on us all at once, you know most of us would race through it if it did.