So... I was SPOT ON about the throwback Snow Elf, but not *quite* on the money with the plot. So, given Skyrim's and Dawnguard's "clues" as to where they might expand, I'm still guessing a Falmer uprising is a probable DLC, with Snow Elves as a playable race a distinct possibility. DG HEAVILY insinuates this through both story AND demonstrated content. Not only that, but I'm still betting heavily this ties in with a Dwemer re-emergence/return. Yeah, yeah, lore-sayers protest, the existing lore does NOT preclude a return of either race.

I'm also going to lay on a guess that the last DLC will just about have to be a resolution to the Thalmor conflict. Skyrim's already proven it can handle a few dozen mobs, friend and foe, actively moving about, so I'm guessing something on the order of 3-4 dozen NPCs duking it out in Braveheart-style battles WILL be a part of this. As long as mages are limited, this should not be a problem at all.

What I'd LIKE to see... you have to make the assumption that you MUST finish the civil war before you can even start the Thalmor. Given that, a player should be around level 20 or so by that time. So, I'm kind of hoping that the Thalmor resolution STARTS with the player being captured. I have a dozen or more ideas as to how this can actually be done (uncheesily), and even a few giving the player the option to choose whether or not his/her character fights, literally, to the death or not rather than be captured. The player would then have to a) choose to join the Thalmor (this could even eliminate capture) or escape from a Thalmor prison thereby beginning the end.

As a subtle ironic twist, the player's "side" might need to recruit Falmer and/or Dwemer factions in order to win. This could even become the Falmer and Dwemer aligning with the "other side" in keeping with Skyrim's overall theme and flavor of sides.

More Falmer I can see, but I highly, highly doubt they will be playable.

As for the Dwemer, they really do not have a way to come back. Being stuck in the skin of their walking brass god, its a tough task.