That has repercussions for any browser based on WebKit, which currently includes Safari on Mac and Windows, various mobile browsers and not least Chrome itself (which uses WebKit as its rendering engine).
Right now there are binaries available for Mac and Windows, and we can probably expect to see test builds of browsers showing up over the next few months as developers get to grips with it. The potential outcome is a more stable, crash-resilient and faster performing browser, which given so many people now live in the web, can't be a bad thing.
This is a heads-up that we will shortly start landing patches for a new WebKit framework that we at Apple have been working on for a while. We currently call this new framework "WebKit2".
Some high-level documentation is available at http://trac.webkit.org/wiki/WebKit2
Currently WebKit2 is available for Mac and Windows, and we would gladly accept patches to add more ports.
We're more than happy to answer any questions you might have, and we hope that this will be a topic of discussion at the WebKit Contributors Meeting.
Anders Carlsson and Sam Weinig.