Bethesda Softworks announced The Shivering Isles, the first full expansion for The Elder Scrolls IV: Oblivion, some time ago. But at the time, they would only confirm it for the PC. Now, though, Xbox 360 owners can rest easy; the expansion is on its way.

Bethesda confirmed today that The Shivering Isles wouldn't just complement the PC version, which means all those RPG fans with a 360 will get the benefit of all those extras. The expansion features more than 30 hours of additional gameplay, new storylines, and even the environment and landscape will alter depending on player decisions. Furthermore, we'll get new creatures, dungeons, and quests, all of which should add a great deal to the Oblivion experience.

However, there is one caveat to the expansion offer: the PC version will be available in retail stores around the country, as expected. But Shivering Isles for the 360 will only be available via download from the Xbox Live Marketplace. So now we've cleared all this up, but yet another question remains- will the expansion also be available for the PS3 version of Oblivion, and if so, how will it be distributed? By normal retail or through the PlayStation Store?

With multiplatform titles, a publisher's work is never done.