According to AppleInsider reader Gregg, developers were sent an email from Apple, as seen above, announcing the latest build of Safari as well as a link to download the software.
Apple notes that enhancements include WebKit tweak for text, layout and accessibility support, as well as a redesigned Web Inspector and a new Activity viewer. The new tools are meant to make debugging websites an easier process.
Safari 6.1 Seed 8 comes around a week and a half after the last release. Developers can download the newest seed from Apple's Developer portal.