Theory Round-up

Rift creatures are the true main villain and the final thing they’re going to fight.
The sentient ‘spirits’ in the lions are actually creatures from the rift as well, they’re just the ‘good’ creatures while the other ones are the ‘bad’ ones.
The Baku from S2E2 is actually possessed by a rift creature and we’re going to see the mermaid world again.
Honerva has already retrieved Lotor from the rift, or we’re going to see a flashback of her going to the Alteans, saving Lotor, bringing them to Oriande, etc.
Lotor doesn’t have his memories anymore, and Honerva’s using that to her advantage, giving him false memories where they were always a family to ensure his loyalty.
Allura is the one that breaks this illusion.
Alternatively, Lotor actually didn’t truly survive the rift or he’s on the edge, and Honerva wants to use Keith, the only other male half-Galra, to heal him, or even put his consciousness into Keith’s body.
Allura is going to face off in a fight against Honerva, however, she’s going to refuse to kill her.
Allura earns the respect of the Alteans and becomes their chosen leader. We won’t hear ‘king, queen, prince, princess, emperor, or empress’ after that.
Allura, alternatively, is going to sacrifice herself, but instead of dying, she ends up ascending and becoming The Lion Goddess that watches over and protects the Alteans and all her friends. (Lotor is there with her too in this scenario).
Honerva is going to mess with time and space, and that’s going to end up releasing the rift creatures. In the end, the only way to get rid of them and fix everything is a huge sacrifice. It’ll end up being Allura, Voltron, or both.
Acxa has been working with Honerva this entire time, but she’s not loyal to her. She’s loyal to Lotor and is doing what she has to do in order to help him.
However, she will end up fighting with Team Voltron in the end.
Ezor died in the explosion in S6.
Alternatively, Ezor didn’t die, but she’s being held captive by Honerva, who is sending Zethrid, her pirates, and some bounty hunters after someone that Zethrid will have to trade for Ezor.
We may learn that Krolia isn’t 100% Galra, explaining the differences in her appearance.
What happened with Lotor and the Alteans was a complete misunderstanding, and the good guys were the one to make a massive mistake there that ended up in the Galra Empire entirely falling into chaos, and Team Voltron losing three years.
Honerva’s stupid cat, Kova, is significant for some reason. This cat is going to drive me nuts.
Kova vs. Kosmo
Lance and Allura are dating at the beginning of the seasons, but they do end up parting ways, and it has nothing to do with death, but rather, a mutual decision.
Keith is going to end up being possessed or controlled in some way, or there’s going to be an attempt to do it.
Lance and Keith are going to end up fighting while Keith’s controlled, however, Lance is actually going to be actively trying to avoid fighting him, only using his sword to block Keith while trying to talk to him, to get through to him. He ends up being successful.
This may or may not happen in the astral plane.
Even if there is no romantic klance, we’re still going to get a hug between the two of them.
While Keith’s incapacitated, Lance ends up piloting Black to save him. It gives him a lot of validation, but he’s happy being the Red Paladin.
Shiro and Lance are going to have some form of discussion to talk that helps Lance sort out his feelings. Likely, this is where Adam will come up again, something along the lines of Shiro not getting a second chance, so in his opinion, Lance should take his since whoever he’s worried about did survive whatever they went through.
Allura’s going to have some kind of revelation that her father wasn’t entirely a person to be idolized, or at the very least, she’ll surpass him and get out of his shadow.
The story began with Lance, and in a sense, it’s likely to end with Lance as well.
Klance.

I may have missed some, or might even think of more as the day goes on. We’ll have to see!

long post theory time I'm going to tag as spoilers just in case I got lucky and predicted something s8 spoilers vld s8 spoilers voltron spoilers vld spoilers we'll see soon klance