Judging from this spyshot, the 2007 Silverado looks pretty much as expected-- a Chevy pick-up with a Tahoe front clip grafted on. Predictable or no, it's a much-needed plug for GM's reputation, for with the introduction of the 2007 Toyota Tundra, the Silverado and stablemate GMC Sierra will officially be the oldest full-size pick-ups on the North American market. It looks like the one pictured might just be a heavy-duty version going through a few more test runs before the truck is launched into production this summer.
[Sources: Autobytel; Brenda Priddy]
(Thanks to Jim for the tip)