As the MacPro has been delayed for so long it will then probably come out together with the MacBook Pro. All with USB 3 then ? Then, I'll hold before getting a new notebook.
Assuming this rumour is accurate, the new Mac Pro will be out in roughly August, iMac in September.
The latest MacBook Pro was released in April. Major revisions of the MacBook Pro are generally six to ten months apart, so an update as soon as August would be highly unusual. An update just for USB3/FW3200 seems unlikely, especially given that Intel is supposed to be releasing the next batch of processors suitable for the MacBook Pro in Q4 2010.
I'd be expecting to see another round of MacBook Pro updates somewhere around November, or early next year, when Intel is due to introduce the next major architecture change: "Sandy Bridge".
USB 3.0 support on laptops is harder to predict. Intel isn't supposed to be adding it as a standard feature of their chipset until about Q2 2011, so if Apple wants it sooner, they will have to use a separate USB 3 controller chip. They can easily do this in the Mac Pro or iMac (plenty of space), but the laptops have less room for extra components. It might show up on the next 15" and 17" models but not in 13" models or the Mac Mini until mid 2011.
Firewire support is already a separate component, so a faster version could appear sooner on laptops, but Apple may want to update to USB 3.0 and Firewire 1600/3200 in sync for each model.
For comparison:
USB 2.0 was introduced on the PowerMac G5 in June 2003, most other models got it in September or October 2003, and all models by April 2004.
Firewire 800 was more complicated as it was limited to high end models for several years. It started on the PowerMac G4 and 17" PowerBook G4 in January 2003, 15" PowerBook G4 got it late that year, but the 12" PowerBook G4 never got it, and it didn't show up on the iMac until late 2006. The Mac Mini was the last model to get Firewire 800, in early 2009.