API/Embedding/Hooks for G3

I have been looking forward to see the approach for embedding G3 into other frameworks / apps.
However it does not seem that any final decissions has been made on this?
I have read the doc on the API, where it is asked that some discussion should happen whether JSON should suffice as data interchange format or XML should be used (possibly represented in the fixed Atom format as indicated here). So where is this discussion taking place? And if it isn't maybe it could take place in this thread?

I am clearly a fan of speed and performance (and simplicity) and would vote for pure JSON. This would certainly be a more efficient format and I do not see enough benefits of making data exchange through Atom.
But I would like to hear implementors' (like myself), core developers and others' thoughts and opinion on this.

Kind regards
Lars Dyhr

PS: Anyone wanting to hear some history on JSON along with some comparisons to other data-exchange formats I highly recommend this screencast "The JSON saga" by Mr. JSON (Douglas Crockford).