What do we know about crossfaction gameplay?

As many, i am excited about the new crossfaction PvE coming in 9.2.5, but i haven't found much info on it other than the original release, i plan on returning to the game and finally returning to the alliance once it goes live or likely a few weeks earlier, with that in mind i would like to know:

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1) Will we be able to trade items and gold between characters on the same realm?

2) Will questing with bnet friends on the opposite faction be possible (Warmode off)?

3) Are all features going to be released when the patch launches, or will they slowly release them?

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What do you think will happen, and will the original release be a test for further integration of the factions or is it likely to be abandoned like so many other features?