So, the ending of Jupiter Ascending sees our titular heroine mastering the sky-surfing boots of Caine, but she's still cleaning toilets. How can the Wachowskis come up with a sequel, let alone 2 more to make an end-to-end trilogy? Here's what I think might happen:
Remember, there were the 3 Abrasax siblings, of which Balem perished, leaving us with Titus and Kalique. Titus, and to a lesser extent his sister Kalique struck me as being almost obsessed with looking young / regeneration. Of the 3, it's Titus who's the most dangerous for me. People often underestimate him (which is what he wants!) due to his pretty boy looks and almost constant fornication / practicing in carnal activities. Now also remember that we were constantly reminded in the film that Earth was this prize jewel, worth more than Titus and Kalique's holdings put together. Why? Simple; the humans on Earth possess the richest strain of the youth serum that the Royals desire. With supplies running out on other worlds, and also not being of a sufficiently high quality, Titus and / or Kalique decide to harvest the Earth by force. However, they'd need to kill Jupiter Jones before a full-scale harvest can occur. Jupiter, with the assistance of the crew of the Aegis, will need to rally rebels and sympathizers alike to mount a credible defence. We Earthlings will still be blissfully oblivious to all of this transpiring just off our planet. That's the rough outline of the plot for the 2nd film.
So where does that leave the 3rd film? Glad you asked. With Jupiter and the anti-Abrasax forces having beat back the harvesting of Earth, Jupiter will want to prevent a harvesting from ever happening, not just on Earth, but all worlds that the Abrasax have seeded. Ever. She and her selected envoys (Caine, Stinger, key crew members of the Aegis, etc.) will journey to key worlds / other Royal dynasties with the goal of uniting them in the battle against the Abrasax siblings. Now here's where I want to see a typical (although there's nothing typical about it) Wachowski twist; I want the recurrence of the Abrasax matriarch which is now Jupiter, to be more than skin deep; she needs to start manifesting personality traits that only those who knew the Abrasax matriarch will recognise. Quite how this plot tangent is handled is up to the creators / writers, etc. The end goal is to not only crush Abrasax, but to eliminate harvesting in its entirety. The trilogy ends with Jupiter reluctantly assuming leadership of all worlds and territories. The end.
My titles for the remaining 2 films are:
Jupiter: Eye of the Storm
Jupiter Ascendant
Now, onto something else; the books, film and TV series' of Frank Herbert's Dune are quite dear to me. Substitute Earth for Arrakis, and the youth serum for the spice, and you have a similar space opera to Dune (which incidentally, was littered with more political and royal intrigue than Game of Thrones and Jupiter Ascending put together!).
My one wish for any future sequels to Jupiter Ascending is for the storylines to be stronger, and more focus on the history of key characters like Caine, Stinger, etc. I *want* to know more about the Sky Jackers. I want to know more about Caine's backstory (so does my wife, but for entirely different reasons, I assure you!).