Most likely all three will be near rough parity.
Less of a leap for Sony, largest leap for the Wii, which will probably focus on providing the most technical improvements for the least amount of money in the interest of being able to sell consoles mass market cheap while still making a decent profit on each one. Not a bad strategy as opposed to pouring R&D funds into a console that has to be sold at a loss for more than most are willing to pay.
My guess for MS is that it will most likely just keep in tune with current PC architecture trends, customized slightly in the interest of making the boxes cheaper to mass produce. In effect, it will be an ultra-cheap gaming PC, manufactured and marketed by MS, capable of playing all current games for Windows in a proprietary Xbox format.







