Not a programmer but don't think there's much fluff, they are just recoding the existing networking for scalability and performance. Brad posted last year about what they were trying to achieve with the network stuff. It's the type of thing that's already in a bunch of mmos like GW2 etc. This is probably adding shitloads of actual time on the project as if they recode it then presumably a fair amount of other stuff has to be adjusted for it as it's fundamental to the entire game. Security is a concern with netcode as it's vulnerable to attack/exploitation and can lead to the database and infrastructure being compromised.
It's interesting to hear them harp on about how fast it is and how it can utilise all the throughput on a network card without using any cpu clocks, not very impressive really, that's just fluff.
Someone with more knowledge can probably tell you more, I'm pretty much a spastic when it comes to [/SPOILER]
