I think if a DLC is likely to cover the Dwemer, it will only be so in the context of the Falmer - there is a lot of hints that they'll be involved in a DLC, what with the hints that they may be away to invade the surface, the way that Dawnguard touched upon them (What with finding some living, uncorrupted falmer and the hints that Gelebor would like to save them), and the addition of extra caravans raided by Falmer, hinting that they are becoming more active.
Falmer or Dwemer, either way it's got to give us more to go on

I'm a little late to this conversation, but I just ran into this today, and it did seem very odd that there is all this unique stuff down there but then it ends up being nothing. I was expecting a dungeon or something, but it does make you wonder if this was just a little side story of little consequence or if this is hinting at something. Has anyone made any attempts to understand that guys journal? He felt like he was leading up to something, but I don't understand.
Welcome

I did go into this a bit on thread #1, quoting various passages and explaining different things in my own opinion. Feel free to quote it and give your own opinion(s).
Reminds me of an joke story, group of people learned how to teleport just by thinking of the location, then disappeared then they thought of the sun.
The Dwemer are smarter then this... Aren't they O.o