The machine is completely functional and futureproof in its current form. Even if
Apple were to shock the world with an earth-shattering super computer for a couple of dollars, it would not change the fact that the current Mac Pro is more than capable.
There's also no guarantee that Mac Pros will be released at MacWorld. If they are released, there's then no guarantee that they'll even be "Shipping Now." There have been times when Mac Pros/Power Macs have taken months from "release" to "ship."
Personally, I'd just be overwhelmed with gratitude to even consider trading up. Not saying that the OP isn't overwhelmed with gratitude, of course.