Disney hadn't announced anything for these rides yet, so there should have been no expectations. There were only rumors. As to what you can expect... the parks will be busy, but the crowds will be concentrated on those two rides. There will of course be the bleed over as some don't want to bother, but those lines should be 2 - 3 hours long each and will hold a lot of people.Will I be safe if I just stay away from those rides on opening day, or will the entire park be incredibly crowded? I'm not a huge fan of overwhelming crowds, so I'm trying to decide what to do. Advice?
Also, rides under huge stress like that can go down. If you notice it's down, ask a CM if they know when it will be up. If it's in a few minutes, hang around, you could get on it, opening day, with little more than a 5 minute wait. We did on Pirates the day it reopened.