And, contrary to that statement, no mention of Awesomium has ever appeared in any of the patch notes from 6.0 (March 2012) forward.
From time to time, as we work on updating portions of the game, we put pieces in place ahead of their actual implementation. For example, the UI changes in advance of the additional bag. Aeseomium is one of those things.
It's not in the patch notes because, aside from the .dlls mentioned, it's not in the game. Once it's finalized and available for use, it will be in the appropriate Update's patch notes.