Extreme Tech reports that VMware will be making an announcement on August 7th at WWDC. While specifics haven't yet been announced, its expected that VMware will be demoing their version of a Windows virtualization product for the Intel Macs. It has been known that VMware has been working on a Mac OS X version of their software. Previous comments revealed that VMware was running on Mac OS X in their labs as early as June.
Parallels received a lot of attention for releasing their virtualization solution in April. Virtualization allows users to run Windows under Mac OS X without having to reboot. There has been speculation that Apple may enter this market with the feature built into the next version of Mac OS X (Leopard), but no definite information is yet available.
Meanwhile, a purported interview with an Apple employee is making the rounds, discussing what to expect at WWDC. In general, while the information is believable, there is no significant revelations beyond what circulating rumors have been predicting.