Let's try this:
- Superman fully in his role now, check
- Lex Luthor/LexCorp in play based on easter eggs in MoS, check
- Genetic material from Krypton ("growth Codex" as it's called in the prequel comic, a small portion of the primary Codex that now resides inside Kal's cells) inside the scout ship (which is still most likely intact and functional as seen behind Zod near the end of MoS) with remnants of a functional Genesis Chamber, check
- Potentially able to be put to use with human technology from LexCorp, check
- Doomsday is apparently a genetically engineered creature made from Kryptonian DNA and other forms of life from that now dead planet, check
- Snyder has stated that for him the "Smallville" TV show is "the new canon" in many respects that he and Goyer used to create this new telling of the Superman legend so it's perfectly logical to assume that some aspects of "Smallville" might be used to continue to the storyline in the films, check
- In "Smallville" Doomsday is created by General Zod and Faora using genetic engineering, check
- It's not that far of a stretch to think it's possible for Snyder and Goyer to work out a line where instead of Zod and Faora (who are now dead in one case and in the Phantom Zone in the other, fate unknown) Lex and LexCorp (and maybe someone or some other agency/organization) are capable of doing their own genetic engineering based on Kryptonian tech featured in MoS to some degrees and create Doomsday - remember, Zod's command key is still in the scout ship (assumption here but a logical one overall) which would mean Kal or
someone else could take control of the ship, check
- The first reaction people get when thinking Doomsday is "He killed Superman" which doesn't necessarily have to happen in the next movie - it would certainly be another twist to things considering everybody went into MoS thinking Zod's going back to the Phantom Zone and obviously that didn't happen, check
- Superman doesn't have to die at the hands of Doomsday in this particular tale, but it sure as hell would prove to be very useful fodder for the next movie, check
- Superman and Doomsday fight, Superman nearly loses, Superman lays waste to Doomsday (not in Metropolis, hopefully), Superman wins, but before he gets to really deal with the triumph...
We get the introduction at the end of the next movie featuring Brainiac who found Earth by picking up the distress beacon from the scout ship which had been broadcasting the entire time.
Also, potentially cue in Kara as well since she's out there someplace and would be awesome to see an appearance from considering the battle that Brainiac and Kal would end up having. No sense thinking that she's not alive since she crashed the scout ship here on Earth 18,000+ years ago and has been missing ever since - let's not forget she got herself all suped up when she fell under the effects of our younger yellow sun. Who knows, she could have been taking a nap inside Sol this entire time.
