A 64 bit processor, has major differences compared to a 32 bit one....For instance, 64 bit wide data bus....Therefore, unless you want to have multiplexed signals (which is not very good), you want 32 more pins for the data bus.....(without taking into account other things you may need). That alone, makes the slot less likely to be kept the same....
The second thing, is the chipset, which will also have to be designed to support the CPU....Current chipsets are designed for 32-bit processors....
The compatibility with current architectures, simply means hammer will use PC hardware and will be able to run programs designed for the 8/16/32 bit x86 processors .
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