This thread is entirely nonsensical.

So many other games would just give you a CGI trailer, maybe some in-game footage and that would be it.
Stuff like skill potencies and rotations wouldn't even be touched.

Be thankful that you know the rough idea of what a good portion of the skills do, and what the general mechanics are about.
There is inevitably going to be some rebalancing through the first couple of patches, and if WHM is really in such a sorry state - it will get looked at after release when everyone has had the chance to play the "final" version of the revamp on the 16th.

You watched the letter with the understanding that potencies and skills aren't final and will likely be adjusted between when they were released and launch.