Looks like those apps are now considered "stable" by upstream, also, they are the first referenced apps in 3.14 release notes and, then, people would like to try them (like me just I bumped ;)) https://help.gnome.org/misc/release-notes/3.14/
go.
+*gnome-extra-apps-3.14.0-r1 (11 Feb 2015) + + 11 Feb 2015; Pacho Ramos <pacho@gentoo.org> + +gnome-extra-apps-3.14.0-r1.ebuild: + Pull in gnome-photos and gnome-weather (#536964) +