The cell notification that Yuusaku won is definitely important to something. I am not convinced Ran and Kogoro's timeline is happening at the same time as what we are seeing at the Kudo house. Maybe some clock checking could confirm that.
I have a feeling Okiya is using a mike, just like Hattori in the Vermouth arc. The actions with the hand in front of the mouth and coughing are too similar. Someone is speaking for Okiya, and Okiya is blocking his mouth to keep Amuro from noticing this. The face mask is a distraction to keep Amuro from noticing that Okiya's voice is being projected and he is not saying the words. At the same time Yuusaku might be relaying what to say to whoever is disguising as Yuusaku (Yukiko?) in America. That would explain the amount of equipment in Conan's hideyhole. He has to coordinate a chain of voices, plus keep an eye on the FBI...
If Shuuichi is asking for Camel to keep the speed and direction steady, it might be to set up for some quick sniping at the chasing cars rather than a jump like I first thought. I want to know why Shuuichi thought Amuro would go after the FBI agents (and how both he and Amuro knew they would go driving) instead of someone like Sera.
Also, I am a bit concerned that Amuro's friends aren't wearing any black. There is no reason that lower level agents are bound to wear black, but it's just a detail that concerns me. (And those guys in front of the Kudo house are definitely news/paparazzi. Look at their vans.)
I am not sure about where Conan is. It looks like a small space.
Chapter 900 might be reserved for the moment that Sera/Ai meets Akai.