3 things I think are important, which I haven't seen commented about yet:
-Anyone else feel sympathetic/sad for Urie? I think Ishida's been subtly expressing that Urie truly is, or feels alone, and that something tragic will happen to him (his doing, or someone else's). As obviously conveyed, Urie keeps his true opinions/feelings to himself almost all the time, but many of his closest allies are slowly floating away from him (though he still has some, like Suzuya).
-Second: I think Touka will be, or may possibly be, Kaneki's source of strength. I haven't seen someone say this speifically yet, but the fact that she said she used to use the ring memento as a source of strength, (obviously) means she is going to use her relationship w/ Kaneki (& possibly others, but mainly just Kaneki I think) as her source of strength. She wants their relationship w/ each other to be enough to go on. Which brings me to my third point.
-I think the centipede could represent two things. First, it could represent what will be a dilemma for Kaneki later - he'll be conflicted between being driven to fight for Touka (faith), or to fight for, well, a wrong reason (could be anger, selfishness, depression,...), in a desperate situation. The second way, could represent torture for a protagonist, unforunately. This could be Touka (which I hate to consider), someone else, or who I think may be likely, Urie (which I'd also hate to happen).
I think Urie will need help from someone, as part of his character's growth (not specifcally from being tortured) - either by revealing his desire for help, or he'll be unwilling to ask for help from others. Otherwise, he'll be in trouble (mentally I mean, not from torture specifically). As in, I think what is a likely scenario, is that he'll be in a situation where he finally gets to talk to Kaneki. Either one on one, w/ Mutsuki later jumping in, or he'll be getting in between Kaneki and Mutsuki, before she can finish saying or doing what she wants. Urie will somehow assist Kaneki (by letting Kaneki get away, because he's suspicious of Mutsuki), and Mutsuki would torture Urie (though he gets mutilated a lot already in the series). This would either end in tragedy, or in Mutsuki's death, and Urie being saved, and being a different person (for the better, hopefully). I doubt he's dying soon though, so I think this scenario would end in Mutsuki's death.
Long post, I apologize!