It's possible, and in particular I wouldn't be surprised to see some new form of open-world content because I remember they briefly mentioned a new outdoor content team when they were asked about dragon racing in some interview.
Since they've already taken inspiration from Guild Wars 2 for Dragon Riding, I'd like to hope that this team might be a sign that they're working on something like GW2's big meta events (its other big strength imo), but that's probably too optimistic.