Nagisa and Honoka became lovers some time before DX 1After all, their power increase with their feelings and friendship for each other, and from the first movie onward they became strong enough to one-shot Zakennas and equivalents without even using magical attacks...
Pretty Cure All Stars takes place prior to the finale of Futari wa Pretty Cure Splash☆Star.Thus, Michiru and Kaoru weren't part of the teamup because they weren't Pretty Cures yet.
Pretty Cure All Stars DX3 won't be the last All Stars movie.After that, the All Stars movie series will take a small hiatus, and in a few years, come back in full force with Pretty Cure All Stars DX4ever Pink, which will be the most badass movie of the franchise.
Cure Echo is actually result of the Décor Miracle Lights' power.During the climax, acknowledging Ayumi's desire to become a Cure herself, Candy and the other mascots wave their Miracle Lights in order to grant her wish. The power of the Miracle Lights not only makes the Cures stronger (like always), but also forms the white Transformation Cure Décor, which allows Ayumi to temporarily become Cure Echo and fight alongside the others. This explains why she isn't present in the ending dance: she loses her powers after Fusion is defeated.
The pre-Fresh characters being Demoted to Extra in Pretty Cure All Stars New Stage is an attempt to keep the movies from turning completely into Forever Pink.Let's face it. Looking at past performance, Love, Tsubomi, Hibiki, and Miyuki are probably already going to be a Spotlight-Stealing Squad. Throw in Nagisa, Saki, and Nozomi, and the writers would probably forget anyone else was in the movie.
Sailor Moon will have a cameo in the next All Stars movie.This would be to promote the upcoming Sailor Moon remake. Pretty Cure has crossed over with Toei's tokusatsu franchises, so crossing with another Toei magical girl anime is possible. If Toei decides to bring back Ojamajo Doreminote , we may also get a Doremi cameo.
Similar to Pretty Cure All Stars, their will be crossover between Toei's magical girl series in the style of Kamen Rider X Super Sentai Superhero Taisen.The crossover would feature characters the following animes, listed in order of the original air date: