Chad,
The website should be updated now. NI-488.2 version 2.0 is released. You can see the current list of GPIB drivers at the http://ni.com/support/gpib/versions.htm page. You can find out more about each driver version by clicking on the appropriate link. You can find this page from the main http://www.ni.com/support page by clicking on the Drivers and Updates link under Option 3. Then, when you take the Current Versions link, you will see links for GPIB and VISA.
As noted on the page, since the GPIB-USB-A hardware already comes with a license, you can download the NI-488.2 driver directly.
NI-VISA 2.6.1 is highly recommended for version 2.0, but it is not required. If you wish to purchase NI-VISA 2.6.1, you can contact your Sales Representative
as the Current Versions link for VISA describes. One way is to use the Contact NI link at the top right corner of the webpage.
Regards,
Geneva Li
GPIB/Serial Product Support Engineer
National Instruments
http://www.ni.com/support