Looks like someone at Steam just goofed and prematurely announced that both The Elder Scrolls III: Morrowind, and ESIV: Oblivion will be available on Steam shortly.
The leak occurred when an ad temporarily appeared containing links to the games, the games were only viewable for a few moments before being delisted, but the ad (at the time of this publication) is still accessible here (or by looking at the image above).
Could this be the start of a new trend? Since Fallout 3 went well on Steam I’m guessing Bethesda is more then happy to publish all their games on Steam.
Here’s hoping we see a Steam release of Daggerfall.
Thanks Scott for the heads up