1) Who did kill Yoshotoki? Nope, it is not V. It looks like Ukaku marks and it seems Amon killed Yoshitoki to save Marude and then Amon fought V, but we need evidence for it since we didn't see Amon and the only evidence to back that he was there is the Ukaku shard.
2) Why Rio gets abused to...
Kaneki kills Rize
all of V members are defeated
Itori and Nico do whatever their mission was and I predict they might attack CCG headquarters for some reason. They might kill Touka and her child with most of the people inside the CCG HQ.
Kaneki returns to the HQ to find a most of people inside...