The artwork definitely has changed. Shameless plug: for a comparison between the artwork of the Uberplay edition and the new Gryphon Games edition, and a photographic tour of the components and game-play, see my comprehensive pictorial review here:
There is one thing that Tom said wrong. The thief doesn't have to steal the highest card one has acquired. Rather, the thief steals One number card (1-10 only) of your choice. That is why it is important to win 1 or 2 so that you can afford to win the thief.