Question and Suggestion for WOTLK realm-information (updated textures)

So I am starting to play on the WOTLK realms again, specifically on Ragnaros, and noticed that there were an option to download Wrath of the Lich King, and to download Wrath of the Lich King (old). Then I looked at this specific quick connection guide: http://forum.warmane.com/showthread....nnection-Guide and saw that one of the installations were one with updated textures. What does this mean? Can I see some pictures of these updated textures? Are there specific realms for these updated texture installations?
These are questions I really would like to just be able to find out myself instead of having to post a thread like this to find out.
That being said, I really want to know the answer to these questions if anyone would be so kind. :]