Why are the Yor no longer a Collective
This has been answered now. From the Yor page:
"Since they were last seen, the Yor have begun to evolve from being a collection of individual sentient beings into a single super-organism. Thus they are now referred to as the Yor Singularity rather than their old moniker of the Yor Collective."
Since when are the Altarians a Republic again
The Altarians are called a Resistance once more.
Why is it suddenly unknown what the Krynn look like, when it was said in GalCiv 2, that they aren't one singular race, but a religious group, consisting of several races, all originating from the same world? Why was their background changed so much, for that matter? I didn't like those religious zealots that much, but I found their background pretty unique
For the most part, this has also been explained now:
"Not a single race at all, the Krynn are an organization of many different minor races through a religious movement. After the defeat of the Korx during the Dread Lord wars, the remaining Korx and their allies joined the Krynn. This in turn changed the Krynn, and has brought the criminal elements of the society once again into ascendancy."
One more thing I still don't understand are the dates. The FAQ says, that the campaign will take place five years after TotA, which means 2232. The Thalan page, however, references 2242, while the Arcean page mentions 2247. So, which is it now?