Look at the things they've added in past patches.
New graphics for underwater visuals
Horseback combat(an entirely new function)
Legendary Skills & Legendary Difficulty
New dialogue for characters
New killcam animations
Adding Imperial Light Armor set to the forges.(They seem to have forgotten the Studded Imperial Armor tho)
It goes to show, they can still expand on the game without releasing major DLCs.
They could probably add other things we want in later updates.