Ok, with the recent talks about brand new browser by Google, I think I can post some "status-update" on the state of WebKit-gtk. Why? Because google chrome uses WebKit as its rendering engine - and that's very good news. With Google being directly interested in WebKit development we could say that bright future awaits. Google uses it, QT4.4 has it in, now we only need to implement it in gnome.
Among various speed and stability improvements there is one big news for me (at least) in the WebKit bugzilla. Patch  for correct font fallback (so far only for freetype backend) for the gtk port of WebKit . I've built a RPM package  with this patch included and the result is great - I can finally read Japanese with WebKit.
One of the worse news is that it seems Epiphany 2.24 will still use gecko, well, what can I say... Take your time and do it right and I'll be happy to wait (and test and report bugs) :-p