I received the following e-mail message from UPS today..
On May 12, 2008 several APIs will be altered in response to the USPS Price Change (<http://www.usps.com/prices/welcome.htm>). While the APIs listed below will remain structurally and syntactically backward compatible, data changes are possibly substantial enough to affect some integrators. Please contact <mailto:email@example.com> (1-800-344-7779) with any specific schema or enumeration questions.
Please review the attached document for detailed overview.
<<Webtools May 12 Price change.doc>>
USPS Internet Customer Care Center
Because of the UPS integration in Magento being tied to this API will there be any problems with Magento pulling correct rates from UPS?