Their own claim is that "they want to make a game that brings something new to the table but is still true to the spirit of starcraft". However, all of the genuinely "new" stuff is being scourged.
I don't know about a list of changes, but I suppose many can be found at sclegacy.com.
Also, I wouldn't make quite the big deal of it if it was about the game *I* wanted them to make. After all, I thought the Soul Hunter was a crap unit, and it was taken out. It was, however, taken out because the fans hated it; not because they wanted to take it out. They were obviously very enthusiastic about the unit. That's a pretty stupid reason to get rid of something you like.