There is also evidence to the contrary too; both Hearthfire and Dawngaurd's trailers end with the Xbox logo, Dragonborn's trailer does not. I don't believe this makes much of a difference though; personally, I believe we will see another situation like we did with Fallout 3/NV - even after the exclusivity deal expires, the Xbox will still get the DLC first. Take what you want from that.
Let me get one thing straight - to avoid people regurgitating that 'self entitlement' argument that has been destroyed time and time again - I am not annoyed that I have to wait, im annoyed because the communication/wording has been utterly terrible. So if you are reading this and planning on using said argument, don't waste your time.
There is confusion over the latest trailer. Essentially, the trailer implies yet another timed exclusive as it only lists the release date for the Xbox version in the description, as does the Bethblog post (December 4th), and does not acknowledge the other platforms. This is just a discussion regarding the DLC's release for PC/PS3 users so please; no flaming or raging (even though that is pretty tempting). Keep it civil.
Someone pointed out that Hearthfire was not marketed as a 'game add on' therefore, did not count as exclusive content; which is not true as It is listed as such in the description for the official trailer: 'Hearthfire, the next official game add-on for The Elder Scrolls V: Skyrim, will be available for download for 400 Microsoft Points on Xbox LIVE? on September 4.'
That begs the question; Assuming that Hearthfire was not exclusive why did we have to wait for a month (longer in the case of the PS3)?