My gut tells me that something BIG is coming in March-April.
Hasbro has chosen to adjust TYT and MYM so that these complement each other, and many indications are that IDW Comics and the games are brought in to create a mosaic of a unified world of all different media. And the thing about the single issue about Twilight Sparkle that will come out, revealed that they intend to reveal her fate. C4 of MYM will see the first clash between Opaline and Sunny. This will end the Opaline Arc at the same time as the Discord Arc ends.
We’ve learned enough to understand that the two alicorns are in a battle over Twilight’s legacy, who will be her successor and decide the Ponykind’s future. This will not end with the Opaline Arc, but Sunny will then move towards her destiny which will be sealed at the end when she is given the choice to become a princess or not. Opaline will only be a learning process for the future alicorn. We know who are the successors of Rarity, Applejack, Rainbow and Pinkie. Sunny doesn’t show up because she has to prove herself worthy, while Misty needs redemption into a new life.
We’ve been given a possible hint as to what happened to Twilight, and that Equestria had collapsed under much more traumatic circumstances than the loss of friendship or just the disappearance of magic. We know Hologram-Twilight will possibly play an important role in S2 which could start in C5, when Sunny must learn to control her powers and travel out into the world in search of new friends and allies.
It is possible that C4 - or C5 - will reveal something essential that will dominate the entire background of G5 towards the end. We’ve been vaguely hinted in a recent children’s book that Opaline may not know how Equestria collapsed, and Twilight ruled over something far, far greater than G4-Equestria. Like if there’s an empire out there waiting for Twilight’s successor. That then brings up a question, to which we will possibly get a small answer; What - or who was responsible for the end of the G4 world?
G5 needs some thrills and excitement after the somewhat lukewarm season we have soon completed.
If we see Grogar’s bell - magically active - at the bottom of the sea, even if the possibility of this is very small - we have got the answer and a lot to look forward to. The idea that Grogar will become the end boss of the G5 and that he was responsible for Equestria’s collapse is very tempting because it would then mean that the ultimate evil in the whole MLP has returned. Then it makes Sunny’s role much more important together with all her friends who will become the New Mane 6.
It is only now that the G5 really starts. Because it’s win or lose for the next few months.