32 Bits - This does imply that it will be(In the future) cheaper for AMD to manufacture a 64 Bit processor and hobbel it, then manufacture a 32 Bit one.
I think that the "one core" flexiable manufacturing is a competitive advantage for AMD, in the arena of Manaufacturing, and R&D.
I think typcially comparing fleaxiable maufacturing to batch runs, has indicated that FM has a lower set-up cost per batch, but higher 'per unit cost'.
This is ideally suited to a segmented market where differentiation allows the manufacturer to maintain margin.
Also it is more difficult to make major strategic errors of product choice, but the volume/Low cost market will be elusive.
Intel are turning notebooks into commodities, in the chip area AMD should play/design for the Server Market and anything else is a bonus.