The information given to us surrounding 5.10 provides a great amount of food for thought, even from what little we actually have. The basic summary of all we know for sure is that the player gets to travel to Ossus to help their original faction and that this is most likely the final instalment of story we'll be getting in 5.0.
From here there are two major questions which this brief summary raise:
- How exactly does the Alliance as a whole feature in all of this?
- Will this story update attempt to remedy the determinant leadership situation we've seen since 5.2?
Both of these are important not just for 5.10 but for any subsequent story as a whole. It is logical to assume that Ossus is essentially a 'teaser' for 6.0 in its entirety: the story should follow an identical structure to the form that the one on Ossus takes. As such, it ideally needs to establish the Alliance and both the Empire and Republic in a 'concrete' form to give as strong an impression about how 6.0 will start as possible.
While this is mostly conjecture, it is worth noting that this post will contain definite spoilers, particularly in the second section. If anyone reading this has yet to do the Iokath story or wants to avoid learning any names for 5.10 I would advise only reading the first section.