I believe all class changes are in the FAQ. There are not very many.
I'm still trying to understand your comment about soulrending. It may be pushed out of the new trainer window, since it only holds so many lines, but it is still available to train. D2 was made prior to the new training window limitation and I was not going to limit changes just because the interface won't handle it. You can use /trainline to do the training. Please try /info in game and talk to Deckard Cain who holds the faq. I did try to document everything, but there is not enough time to both write a custom server and document all the changes. And, honestly, I don't remember all of them
