Seriously, I don't really care when Ep16 is released, I just wanna hear Ame playing some piano.
Come on Ame, do it for the fans.
That said, if one episode takes approximately 1-1.5 years, and we have 3 episode left, it's gonna be quite sometime until Ame starts working on Starlight Divide.
On the mega evo topic, I think the game becomes significantly easier after 8-9th gym. For example, Ciel with Mega Altaria , was surprisingly easy for me, even without any ice-pokemon. So I'm fine with us not getting mega ring until post- E4.