Cataclysm Classic - How much will they change?

Deathwings imprint was left on the rear part of Stormwind… They removed the druid area and replaced it with burned out barracks. Plus I thought that one of the main statues in the Valley of Heroes fell on the bridge and was left there until MoP was released

I’m mainly interested in that the landscape changed which is what we see today while playing retail… transmogging, nearly all quest were changed or relocated and that I was finally able to play a Dwarf Shaman of Dwarf mage. Played a Worgen once, wasn’t impressed but I did like the landscape of the worgen areas. The game along with the world was more drawn out and seemed to offer more area accessibility.

However I’m unsure as to if the reboot will alter the weapons speeds as I’m not sure when this changed.