Neverwinter - Interview @ GameBanshee
GameBanshee is next along with a Neverwinter interview, featuring Jack Emmert and PR guy Ivan Sulic. Here's a snip on soloing, although Jack isn't keen to embrace solo play:
In the preliminary information you've released, you mention AI-controlled allies. Is there a minimum party size required in order to tackle any of the game's quests? Or can a player take on most or even all content solo if they choose to?
Jack: I'd like to emphasize that, while you can play solo, we're building the gameplay experience around party play (just like D&D 4e is), and henchmen fill the roles of missing friends in your party (so you can experience the cooperative aspects of the game etc.).