Something I'd like to add is that if they are adding this dynamic content in a similar manner to how they did so in the original Guild Wars, it's likely to piss some people off. Namely, they did so by instancing everything. The moment you step out of town, you were in an instance. This did mean that, depending on what quests you had active, the world outside could be monumentally different. However, a lot of players here seem to get pissed off by the concept of instancing, and it doesn't seem very feasible to have this sort of dynamic content without instancing. Not unless you make EVERY quest in the game something where you just had to be in the right place at the right time to catch it while it was going on.