Well, technically not Apple the entity, but an employee of Apple named Anders Carlsson announced WebKit 2 yesterday and for geeks it could easily have been a Jobsian "One more 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".
They're also offering non-blocking API which Clint Ecker at Ars Technica</a says:
should result in much more responsive applications which hook into WebKit2. Theoretically, while the renderer is rendering something, the main application loop can move on to doing something else as requested by a user.
WebKit is the open-source browser rendering engine that originated as KHTML/Konquerer on Linux but was taken under Apple's wing and became the core of Safari on both the desktop and the iPhone, iPod touch, and iPad. (Google also uses it for Chrome, Android, and Chrome OS, Palm for the webOS browser, and RIM is developing a WebKit browser for BlackBerry).