While we don't have anything definitive at this point we have heard some things and you can decide if it's good or bad.
The planned upgrades will not be the final upgrades. They will change GB's or revisit GB's as needed and as power creep makes them obsolete again. But that is not all. Everything is on the table with these changes.
Some will be buffed. That is to be expected but some may be nerfed. That was unexpected and not welcomed. It's one thing to give players who have built a GB something extra it's another to take something away. But that's not the worst of it.
Some GB's may have their abilities or mechanism changed. That's a problem. Nobody complained that the Observatory was given blue fighting boosts. If you take anything away though there will be problems.
Let's all hope the sane people win the day on this issue.
Just to add...none of us here play Elvenar but the dev we spoke to mentioned how they changed the Ancient Wonders in that game and it went very badly in that community. Let's hope they've learned from that.