2GB for the whole system would be a major disapointment after 7 years, assuming 2012 is for real. MS would cheap out. The new box has to have 4GB of RAM, especially with all the multimedia stuff MS will bring to the new Xbox and Windows operating on it as well. I hope the 2 GB are only for the CPU and the GPU gets their own 2gigs of RAM.
Dual gpus are such a waste of silicon. Using the same budgets a single gpus solution will spank it.