So basically Xbox One will have 100% dedicated servers due to Microsoft's massive network of servers. To basically not "screw" Sony platforms, Activision will be providing the hybrid system and providing "some" dedicated servers. This is basically what we have today with Black Ops 2 with League Play being dedicated. 360 will also get the hybrid system simply due to the massive community numbers expected. So, IW will never admit this as it undermines competing consoles, but Xbox One will be the only true 100% dedicated server experience.
Will you release info about the server locations per platform ? That would be very interesting information.
For example i can ping the dedis that were used for testing in BO2 around 50ms which is okay (if i remember correctly i tracerouted them to Germany, UK and France), but if for some reason there would be a server more closer by here in Scandinavia it would obviously be better..
It's understandable if you will only have them at the most populated locations, and listen servers are fine too as long as the matchmaking is good, but more info on this would be appreciated.