Heh, I noticed this sometime ago on the UOGold Download page at Fileplanet

It's the one EA links or LINKED to (Not sure if it still is) on their UO.com page
FilePlanet: Ultima Online Gold 15-day Trial

Couple of things to note

Obviously the colour of the dragon and clothing, is ...interesting, to say the least
But also the horse she/he is riding, it looks like a silver steed of some kind (Due to the whiteish haze/colour)
Notice the persons clothing to, the collar has funny flaps on it? I've not seen that in game before.
And I've never seen that building or surrounding before either.