Where exactly do your expectations lie, OP? Do they line up directly with changes you're hoping for?
I would love nothing more than for Yoshi to come out and say they are going to nerf WAR to the ground and reduce the power of healer oGCDs by half. However, my expectations are very far from those kind of changes.
Ultimately, I know that there will be changes because there always is come a new expansion. I know some things I will approve of, others I will not. You have to make a decision whether or not to buy the next expansion and roll with it. You don't have to make that decision right now. There is still a lot Yoshi and co. cannot reveal at this time. I'd say around the time of the job actions trailer is when we will know enough about what's going on to make an informed decision. It's ok to remain hopeful, but keep your expectations reasonably grounded.