IncGamers has a statement from ArenaNet co-founder Mike O'Brien about Jeff Strain's departure from NCsoft. He offers some personal reflections in the full post, and here's part of how this related to development of Guild Wars II, or more precisely, how it will not impact the release of the online RPG sequel:

It's important to understand that ArenaNet is a separate and self-contained development studio. Jeff hasn't been involved in the day-to-day development of Guild Wars 2 since he left ArenaNet more than a year ago, and I don't expect his departure to have a direct impact on our studio or on Guild Wars 2. I continue to lead ArenaNet, and I'm not going anywhere.