Wat??? The idea they can just decide on how 'low' they can go based what their competitor has previously just shown is silly. Things like prices are usually not decided within such little timeframe. Unless they already considered multiple prices that seems far fetched to think they can adjust how low they can go.
Sorry, I was talking about Sony's flexibility to announce a price drop. Microsoft knows their price for sure by now, they don't have any flexibility at this point. I'm simply suggesting that knowing Microsoft's price for the scorpio in front of their conference is a valuable piece of information. They can either choose to respond with a price drop on Pro if Microsoft hits it out of the park, or they can stay put. Sony can't respond (on E3 stage at least) to scorpio price if Microsoft's conference is after theirs.