AtomPub will drink WFS's milkshake

Sooner or later. If you don't believe me, read Dare Obasanjo:

... Back in the RSS vs. Atom days I used to get frustrated that people were spending so much time reinventing the wheel with an RSS clone when the real gaping hole in the infrastructure was a standard editing protocol. It took a little longer than I expected (Sam Ruby started talking about in 2003) but the effort has succeeded way beyond my wildest dreams. All I wanted was a standard editing protocol for blogs and content management systems and we've gotten so much more.

Structurally, GIS data is pretty mundane, tabular stuff, and a good fit for AtomPub. Unless the tooling coming out of Microsoft turns out to be vapor and Google's push to become the ITCZ of cloud computing bonks, AtomPub will be ubiquitous. You'll be using it for sound, photos, video, contacts, social data -- and you'll be using it for spatial data too.