Just saw this. I'm indifferent. On a whole I would say that the art has not been SR4's strong point so far, but it's been on an acceptable level at least. Mostly we see generic fantasy art like this new cover, though. Shadowrun has too many artists, and only a small number of them has a style that you can relate specificly to Shadowrun.
The games that have the best art style has one artist do all the colour panes and only has a couple of artists do the rest of the illustrations. Best, most atmosphericly correct and fateful art of all rpg's I know of at the moment: Drakar och Demoner (from Sweden).
Link. They use almost exclusively Paul Bonner for covers, and the only other artists you will see artwork from are Tapia and Bergting (and one more with a similar style I believe). To me, this way of doing it creates a much more concistent atmosphere for the game.
Another example (also from Sweden) is Mutant.
Link. There we have another game with a great graphical design that is concistently upheld because it's the same guy doing all of the covers, and only a couple of others joining in for illustrations.
Though I realize that it may be a question of rate of publication, the fact is that both of these games have had more books published for them than Shadowrun lately.
<edit> Note that I'm not saying I would like Fanpro to sign on Paul Bonner too or something. I really didn't like what he did for Shadowrun in the past. What they should do is to let a selected few artists work for a long time with the game so they could come up with an art style that works, then stick with that. As it is now the vibes you get range from fantasy kitch galore to comic book actiontoon to dirty cyberpunk.