I have noticed that the default chat color is now yellow. I think it is kind of a bad idea because the color for all the faction stuff is yellow also. It makes it hard to notice some faction notifications and other things with factions. Like if someone claimed/unclaimed land or someone if joined/left the faction.
The whole idea of changing it to Yellow was so that non donators don't blend in with the other messages in chat. We can just change the colour of factions messages.