That's a good question, but I doubt we'll see a new engine in the truck series anytime soon. Maybe a year or two down the road, but for now, I think they'll be sticking with the current engine.
They are still Roush-Yates engines in the truck series, so I'm not sure how different they are... if they're not much different, we could see the engine in Crawford's truck by the end of 2010, but I think that's the earliest you can expect it.