I doubt that's a hint to the next movie featuring the Kami Trio, there's still 4 other main legenaries that they need to fit in and the more legendaries in one movie would not be that good in my opinion. But it's nice to know they appeared here, even if it was in the credits.
It's nice to see Peg and I thought Dread would be good in the end, with his family there and the fact that he's doing what he thinks is good for the wrong reasons. I heard that Pikachu battles Throh in one movie during the opening sequence and Sawk in the other. The trainer wasn't shown.
Emolga scene sounds interesting, well the whole battles sound interesting to me, maybe not Pansage's and Tepig's battle but especially Oshawott's. The fighting scenes near the end seem interesting, with all those trailers out their, I can't wait to see the movies, especially the Reshiram one.