The 3200 number is there because the chipset features 32 lanes for dual PCIe 16X graphic cards and the rest of the name is logical.
Motherboard manufacturers are making these boards as we speak and there should be some retail boards at launch time. The boards are scheduled for a double jeopardy launch with the new graphic chip R580, known as Radeon X1900XTX. If all goes well, we should see both of these products on 24th of January.
ATI’s Upcoming Chipset to be Dubbed 3200
Source: The Inquirer
ATI’s upcoming X16 chipset is going to be called the XPress 3200 according to the InqWell.