These screenshots are from late builds of the Beta. Some of the content might be missing but it should give you a pretty good idea of what to expect on live servers!
These screenshots are from older versions of the Alpha. They are mostly here to show the improved water engine and/or major changes made to the zone since the first alpha build.
Alpha screenshots are an early preview of the expansion. A lot of stuff could be missing depending on the zone and the quality of the water might be slightly lower than what you will get in the final game. All zones will eventually have up to date screenshots with improved graphics and monsters/NPCs.