Posted
— October 17, 2008 at 5:04 p.m. PDT
According to a translation of the Japanese Street Fighter 4 blog,
Gouken and Seth will be playable in the home release of Street Fighter 4, but not in the arcade.
They also posted some new artwork for both characters.

You can check out slightly larger versions of
these images here, and also scope out the link above from some concept sketches.
If Capcom doesn't balance these guys like they did for all of the rest of the characters, I seriously hope they disable them completely for online play.
It was a ridiculous decision to allow Gill to be playable online in Street Fighter 3 Third Strike, and I hope it's a decision Capcom doesn't repeat.
Thanks go out to Reno for the translation.