I think they are going to reveal basic info too, but maybe won't detail specially in the places they can tweak it depending on Durango's data to be announced.
Example : they can announce the processor, the GPU, how the box and the controller looks, games, to say that they won' t repeat the $599 fiasco, and that is going to be released this year in US and that is going to use GDDR5. But wait for E3 for the exact release dates, exact price and amount of RAM.
i doubt they will tweak anything anymore... but they wont be announcing a lot simply because so we can talk about it more
if they told us everything there would be nothing left to anticipate but release, which will be i guess up to year or more away for all of the markets....
so they will trickle information at least on 3 different events leading to reveal.