Because I can't seem to figure out how to post images, here are the links to some pictures I just took in 3.3.5 WoW and the Beta, comparing Stormwind.
http://i53.tinypic.com/11ad0di.jpg - Auction House (Cataclysm)
http://i54.tinypic.com/2u7vzmd.jpg - Auction House (WotLK)
http://oi55.tinypic.com/2nv55r6.jpg - Canals (Cataclysm) - between the Dwarven District and Cathedral Square
http://oi56.tinypic.com/2mra0b4.jpg - Canals (WotLK)
http://i56.tinypic.com/2emlq9f.jpg - Cathedral Square (Cataclysm)
http://oi53.tinypic.com/2icb7rk.jpg - Cathedral Square (WotLK)
http://oi54.tinypic.com/eklxdy.jpg - Cathedral Square (Cataclysm)
http://oi51.tinypic.com/zwj48k.jpg - Cathedral Square (WotLK)
http://oi53.tinypic.com/6f6zxd.jpg - Dwarven District (Cataclysm)
http://oi55.tinypic.com/sbr776.jpg - Dwarven District (WotLK)
http://oi54.tinypic.com/kdo612.jpg - Dwarven District (Cataclysm)
http://oi56.tinypic.com/2ywwwec.jpg - Dwarven District (WotLK)
http://oi51.tinypic.com/16kyu15.jpg - Stormwind Keep (Cataclysm)
http://oi52.tinypic.com/r1h8qs.jpg - Stormwind keep (WotLK)
http://oi54.tinypic.com/bis7zn.jpg - The Park (Cataclysm)
http://oi55.tinypic.com/141jqyv.jpg - The Park (WotLK)
http://oi52.tinypic.com/2a6ozth.jpg - The Park (Cataclysm)
http://oi53.tinypic.com/2s7z0vq.jpg - The Park (WotLK)
http://oi55.tinypic.com/2vt4cir.jpg - Valley of Heroes (Cataclysm)
http://oi54.tinypic.com/ou0d9c.jpg - Valley of Heroes (WotLK)
http://oi56.tinypic.com/2hdz1p3.jpg - Valley of Heroes (Cataclysm)
http://oi55.tinypic.com/260czs0.jpg - Valley of Heroes (WotLK)
http://oi54.tinypic.com/140ajas.jpg - Old Town (Cataclysm)
http://oi51.tinypic.com/w7bwi1.jpg - Old Town (WotLK)
http://oi51.tinypic.com/20sug7q.jpg - Old Town (Cataclysm)
http://oi54.tinypic.com/96f9jc.jpg - Old Town (WotLK)
Also, a poll. Because why not.