The Update on Patches-Updates-Content-Etc. on The Elder Scrolls Forums (thanks Voodoo Extreme) has word on plans for an upcoming patch for Elder Scrolls IV: Oblivion to address a number of reported issues. The patch will appear in beta form for the PC first, and when finalized will also be made available for the Xbox 360 edition, and following all that they will be releasing a patch for the European editions of the game to address localization issues. The post goes on to describe the next couple of bits of content they will be offering for sale, the quest to repair the Imperial Orrery and a structure called the Wizard's Tower. The update concludes by justifying the high price of add-on content, but admits they are experimenting in finding a price point that reduces sticker shock:

We hope to have The Orrery available for purchase next week. This plugin will cost 150pts on Xbox, and $1.89 on the PC. The Horse Armor Pack has been very popular, and exceeded what we thought it would sell. Despite that, we’re still trying to find the right spot, so we’re putting a much larger plugin out for less than the last one and we'll see what happens. Your feedback as we move forward in this is invaluable. Tell us what you want to see, how much of it, and what it might be worth to you. No, don’t say you want it free, because these plugins take a surprising amount of time to create, polish, and test (much more then Morrowind's).