The Inquirer is claiming that Clovertown-based Mac Pros may finally see the light of day tomorrow. However, the site has a limited rumor record, and the precise timing of the announcement of Clovertown-based Mac Pros has even eluded traditionally reliable AppleInsider.
A more plausible time-frame for a Mac Pro refresh may be Apple's NAB special event, which one earlier page 2 rumor had indicated would bring updated Mac Pros with HD media support.
Some of The Inquirer's prior rumor record can be found here.