It's almost certainly the case that the trade system is reserved as the subject of a developer diary (or possibly multiple DDs) and as a result the developers are probably going to be pretty mute on the subject for now. We'll just have to speculate until then.
This man knows what he is talking about here. We have a new trade system, it is already fairly far advanced in implementation, but we won't talk fully about it until it is done. That way what we promise will be delivered.