I have read that people are not happy about KHTML. As one who spoke once against KHTML, and pro QtWebKit (or QWebKit?). This is why I want to keep KHTML:
Native widgets. Not emulated like WebKit/Gecko, but real Qt widgets. This means that I can have a text widget which fully supports BiDi (not gecko, not webkit, only IE has one... and KHTML).
Also, widgets get drawed funky if the direction of the page is opposite to the direction of your desktop on WebKit (you can see it in chrome, Arora and Safari). For example see the combo boxes in http://www.aljazeera.net/Portal.
Still, I think that KHTML is not something we can handle today. Sorry, even tough KHTML is great, WebKit is what the market needs, it's what we as a community need.