I just added Gears 0.4.15.0 into xPUD build script, with plate UI updates and new packages. Hopefully we can release a development version in a week.
So we're trying to put plate into Gears, and the experiment of porting plate onto Webkit (or even clutter) is started.
Ted Dziuba wrote an interesting article talking about WebOS myth, and I think that's the reason I start xPUD project. :-)