When DLC is released it will be released exclusively for the XBO360 for one month before it is released for everyone else.
Which is a very bad system marketing wise. Because while people on the other consoles and on the PC will still buy DLC when it becomes available, bethesda will lose alot of credibility from those users and will have a lot of unhappy players when the 360 players will obviously gloat and post spoilers everywhere on the internet.
I don't know, as a PC user, I don't really care.
For one thing, PC players are going to be playing the game a lot longer than the XBox crowd because we're going to be using mods to extend our enjoyment of the game. People will still be buying the PC version long after every DLC has come out.
For another, the DLC are usually something of a rip-off for a PC user, anyway.
I mean, Bethesda's first try at DLC became synonymous with "not getting your money's worth out of a DLC". So, basically, you could spend $5 on having a new texture for your horse and 500 extra horse hit points, OR you could download a free mod that lets you replace your horse with a ridable bear, dragon, flying pirate ship, etc. Which one is cooler and more enjoyable, and oh yes, also FREE?
I actually bought the Frostcrag Spire one, but then used mods to upgrade it because it wasn't to my taste, entirely... and some of the house mods included things like that lovely extra-dimensional wallless, roofless "house" that floats in a void that you can teleport to in order to use its storage bins at any time, which felt FAR more thematically exciting than Frostcrag.
I'll get a DLC that actually adds something interesting to the game, like a largish quest line like the Knights of the Nine did or some new functionality, but otherwise, mods are going to be far more interesting to me.