When I started S4F Wiki I didn't concern myself with the look of the site so much, I just posted it ASAP and invited everybody I knew. Now that the content is coming along (very nicely!) I want to move away from the green/white look for something a little more appealing. The changes will not affect any of the content of the site.
If you're familiar with CSS you know that changing the way the site looks is actually pretty simple. Along with a new color scheme we'll have a new banner and fonts. Heading fonts 1-6 will be updated to fit the new theme.
There is not a definite date on when the changes will appear.