The majority of these features have already existed in the upstream WebKit Inspector for several years, but because they ripped out the original javascript implementation to replace with V8, the Chrome people couldn't use any of it.
Since it's been added to the Chromium project, then even if they haven't pushed it upstream to WebKit, WebKit can always pull it from downstream if they want it.
Granted, it may not be that simple since Chrome uses V8 for its Javascript VM, and these features likely tie directly into V8 abilities that may not be available in the basic WebKit package.
Or maybe I'm talking from ignorance. Please let me know if I am.
What would be great is the ability to edit javascript and then save the edited file somewhere. Otherwise I can see alot of copy and paste in my future!