Adding to this just to weigh in. I will not be buying this expansion until it's confirmed that the runes I made so that I could maintain and try out every build whenever I want will retain that functionality. I don't care if anet is going to "compensate" me for it. They could send me six boxes that let me pick any other legendary in the game and it wouldn't replace what I actually crafted legendary runes for: not needing to fuss about to gain the effect that actually matters from runes on my builds.
If I have to go do chores to play the same builds I have right now, I'll just uninstall for six years like I did when anet first implemented ascended gear with a hard time gate that completely discouraged alt-based play.