According to Claudio Saavedra who made the announcement:
“This will certainly be the most prominent new feature of Epiphany in GNOME 3.6, and we believe you’ll love it. Personally, I think that this is a huge usability improvement, but I’m much more excited about the possibilities this brings from here on. For 3.8, our plans are more ambitious, but I guess that we will talk more about it when the time is due.”
To see what’s more to come concerning the 3.6 release of Epiphany, read the application roadmap!