A fair few were hoping for Sam.
And then there are those like me that don't particularly care. Even if you're a Sam fan, we were told not to expect anything interesting to happen this update.
Personally, clearly, I'm just waiting around for the full Ellie event.
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Most of us are just looking for PROGRESS.
But you are right most of us have an interest or as I like to say, "having a horse in the race." For the Sam route fans, even a short meeting could have serious consequences and for the sake of time, rendering, and resources it has to put into motion something big.
Let's pretend, Sam shows up at the door and Sophie is dumbfounded at his unexpected arrival-- all the memories flood back to Sophie of her last encounter with Sam, and Sam is acting upon the ground he gained with Sophie while in his room. Likely the developer gives the player the options, "break it off with Sam," or "Comfort Sam"--and while in the 'comforting' of Sam, Sophie and Sam makes out and the story continues the Sam route....
But it's very important this time if the developer has any good sense, Sophie has to come to the idea her relationship with Sam will go too far. A good writer at this point would exploit this turn of events and make Sophie, scared, excited, confused, anticipating, and generally a jumble of emotions so that when Sophia and Sam have their moment it seems natural.
Your Ellie event, you are waiting on ought to have similar care in the crafting of it.