ThinkSecret is saying that Apple will announce the Mac Pro and a newly designed enclosure at its World Wide Developers Conference next month. The Mac Pro is the rumored name of the Intel machines that will replace the PowerMac G5's.
According to the rumor site, the new Mac Pro's will come in configurations similar to the PowerMac G5, including single and dual processor systems. I suspect the new machines will be sporting the newly released Core 2 Duo Intel processors, however, what I am having a hard time visualizing is what Apple will do to the enclosure. With the MacBook and MacBook Pro, Apple has continued to distinguish their pro machines by their shiny aluminum exteriors. Will Apple stay with the monolithic cheese graters, or will they go with something more subdued and refined? Only time will tell.