Description of problem: Epiphany is currently at 2.15.1 in Development but extensions is stuck at 2.14.1 The updated tarball can be found here: http://ftp.gnome.org/pub/GNOME/sources/epiphany-extensions/2.15/
2.15.2-1 is in Extras for Development (pushed into the repo on August 29 according to the metadata). Chris: Please remember to close your bugs when you fix them! Thanks. :)
Closing this as CURRENTRELEASE, since 2.16.0 has been in Extras for quite some time.