Guild Wars has some fantastic concept art. We've mentioned this in the past, particularly in the context of the work of ArenaNet art director Daniel Dociu and concept art lead Kekai Kotaki as seen at Spectrum Fantastic Art. In fact, the last thing we asked was, "Does this give some hints as to what we'll be seeing in Guild Wars 2?" It turns out, it does.
In fact, Guild Wars 2 concept art is now appearing in other places as well. Ravious at Kill Ten Rats hunted down more GW2 art by Dociu and Kotaki, as confirmed by ArenaNet's Regina Buenaobra. Check out the post on GW2 concept art by Ravious over at Kill Ten Rats, which features some examples of what he's found along with some background on what they may show of the next game's setting, "250 years after the original Guild Wars."