According to a news item on Boardgame News, The Settlers of Catan has already been made available for the XBox, and will soon be playable on the Sony PlayStation 3.  A press release has been quoted as saying:

As of December 18, 2008, Game Republic is pleased to announce its release of the board game Catan, the first in its Board Game Republic series of casual downloadable content. Catan will be distributed via the PLAYSTATION Network, and plans exist to add PlayStation Home interactivity in the future.

Catan is the first in the Board Game Republic series of light, casual downloadable games! So far, the game is slated to be launched in Japan this month, soon to be followed by releases in other regions, including the U.S.