I have a partial list of where it was posted here: http://www.coh2.org/topic/8493/to-relic-concerning-dce-preorder.
It includes our site, COH2.ORG, gamereplays, Relic News, Steam, Amazon and a selection of press. We were as clear as possible about the change and what it included and did our best to let everyone know. It's unfortunate that people missed it and we're sorry if you did.
To be honest, that was not the problem for me. I knew very well of the changes made to the preorder collectors edition. It was, like you said, posted all over the place.
My concern lies within it's value. And i think I speak for more than just myself on this one. I do not expect free commanders or other DLC for the rest of my life just for owning the DCE. A little more bang for my buck, though. See, you never defined the ToW DLC to be split in two halves. And this is the point. DCE should get the whole pack with both factions, fairness wise.