Almost all the DLC features could of been in the game. In the trailer you can attack whilst on a horse (its there for about two seconds). Also from a loading screen on the 360 I could see that they'd put in Dragon weaponry that should of been with the original copy.
They had a set release to go for without leniency, and game development actually ends about a month before release so that publisher stuff can happen.
Horse combat isn't part of the dlc and its not like they are sell a dragon bone weapons dlc, they are selling a quest series, that's what the dlc is. The rest of the stuff is thrown in for stuffs and giggles.
You are being such a little bitch about this.