If you missed the Tour video.

[Obysuca]

As for the release date, SE themselves already stated Spring 2015 and most people had already guessed late May as the release based on the 3-month patch cycle we have. In the presentation they admit that late May actually WAS the planned release date and they only recently put it back. So at the time you 'called' that you were actually wrong...

Actually, a majority of people were guessing it'd be April. And considering SE said recently that it was planned for May and I had guessed upon first news of the expansion being in Spring, so no, I wasn't wrong

Coerthas Western Highlands was one of those regions found in the files, along with West Shroud which is NOT in that trailer.

You mean 1.0 zones that are still in the data files? Sure. You do realize theres always zones/music/other data that never get used right? Look at XI and other mmos, theres some files that have been in it since release that are never used.