A little update on the off-chance that someone might find this interesting... Fedora had been projecting to incorporate E17 into Fedora 19, but the feature list has now been updated without it. So now probably about a year before one can expect E17 to show up in Fedora 20.
This was a bit disappointing to me, so I just wiped a Fedora LXDE spin from an Atom-based netbook that I carry around fairly often and went to Bodhi and E17. The system now uses 70-some mb of ram after boot (i.e. less ram than a single open instance of Firefox by itself), and programs come up significantly faster. For example, Firefox had been taking ~17 seconds to come up in Fedora/LXDE (which had been a rather annoying wait time), and now comes up in ~7 seconds.
This is similar to independently reported performance gains over stock Ubuntu -- one test
had GIMP coming up in 11.1 seconds under Ubuntu and 4.7 seconds in Bodhi (though I don't know the hardware on that test).