Beware this theory may comport a lot of spoilers about June 2023's event !
In the end of the event (im talking about the final fight with Apophis), we hear about Osiris and some other gods but... Shai ? What about Shai ? Osiris : we never see him; Shai : brings up the context at the beginning of the event.
Maybe this event will be continued onto another plot, you'd be able to have almost the same plot than June 2023's but it would add some of the gods : Osiris for exemple ! He's on of the gods that we could learn about more if we had him in an event in physical form/physical contact with our character, which means Shai could become a powerful god for the next event's version, Shai, Anubis, Bast and Seth them four together would accompany us as we fight Apophis again :
Anubis will get us back from the dead world
Bast would heal us fully, mentally and phisically
Seth would track Apophis so we know it's hiding spot
Shai protects us and the three other gods !
During the final fight with Anubis, the four gods would add 60 to our actual damages
Once the final battle would've happened, Osiris comes, Apophis is sent back to the underworld, Osiris talks to Shai while Bast, Anubis, Seth and us the player talk.
What would they be talking about ?
Why don't you guess it yourselves, my friends ?
I dont think that's happening; the event is cyclic and repeats the same every year, so it cant really get any alternative endings. So even if other gods "join" us like the additional gods added this year, it will be just a small flavor addon and not something like all three gods fighting together. The event's been the same as it was introduced years ago, its not the first year its up, so I doubt there'd be much changes to the plot.