I looked at easystroke and see no direct linkage to glib2 in there, although it uses a few libraries that would link to it.
While there's a very good change that the gtk+3 related libraries will see an update, I'm more hesitant to do the same on the gtk+2 side. That's the "stable" branch that a lot of thing depend upon, and it wasn't all that long ago that we updated those and endured a lot of breakage. I haven't yet looked to see what all the differences are, but given past experiences I would expect to see a lot of widely used functions deprecated or removed. I will do some research on it though and see what I can find out.