I've previously said this before, I highly doubt places like Elsywere Blackmarch, ( other places in Tamriel we haven't been to), and Akavir will be in DLC.
Why? There is so mutch content in these places not suitable for DLC, but for a game itself. I wouldn't want to see Akavir in a DLC, and won't see it as a game till 12 years later.
I think well have more Dragon, Daedra, and Thalmor Content then anything, but the Vamire Lord for dawnguard was a huge suprise I didn't ex[ect this to ever get in the full game, so you never know.
Completely agree with the Akavir idea. Should be made into a game, but it is more likely you'll go there in the MMORPG in the works. They just need to fix the continuity errors on whether the Akavir are/have been human or beast folk (Tsaeci, etc.)
Expect more Daedra and Dragon based content for sure; its what the series as we know it is based on (at least the conflict between Aedra and Daedra vs. Man and Mer)
Expanding on current provinces like Elsweyr or Hammerfell require Beths to go back and re-construct parts of Daggerfall and Arena in Skyrim graphics so hardcoe lore players won't crap their pants when they realize a street is missing or a key landmark is gone. If anything, they should expand on the calendar and holidays aspect of the game. Lots of interesting random events could ensue.
I have to say, riding a dragon doesn't fly too well with me, if you'll pardon the pun. Flying mounts would ruin the main aspect of exploration in the game for me. It's bad enough they implemented carriages. Fast travel I can understand, but half the fun of a TES game is stumbling across an ancient ruin or run-down city. Carriages take out the fun of finding waypoints.
Spears are an excellent idea. As is underwater combat, mainly because slaughterfish need to die a horrible, painful death. I'm starting to consider them as bad as cliff racers. Thank St. Jiub. Spears seem the next logical step in the progress of weapons in Skyrim. The mechanics could be similar to the staff animations, with a bit more oomph. Add the fact you could smith them from the same materials as Arrows for the basic spear to the advanced materials used in high level weapons. A daedric spear would look amazing on my Khajiit.
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I really just want better housing and better followers. Maybe more diverse magicks too. I would love to have spells like Levitate, Passwall and skills like Acrobatics again. Being a mage is super boring unless you can summon Daedra.