E20 isn't an actual release yet and won't be for awhile. Those packages are early git snapshots that will not be representative of what E20 will actually end up looking like until it is much closer to a release date.
That "article" is just an example of a click bait headline trying to get folks excited over a larger version number and not much else. I don't plan to start building early snapshots of what will become E20 until there are significant differences between between it and the current E19 desktop.
As for your comment about XFCE panel and Mint - that is likely the same thing I mentioned here, namely the xfce-panel package is over writing settings it shouldn't be in relation to xdg/enlightenment open commands.
~JeffGo to the full post