Here's a snippet from a Ford press release:

EcoBoost for truck applications joins F-150 lineup
Joining the lineup for the F-150 in 2010 is a version of Ford's EcoBoost engine, specially engineered and optimized for truck applications.

This new engine builds off the strengths of the EcoBoost system, which include:

Peak torque that begins at a low engine speed and continues across a wide rpm band, making it ideally suited for trailer towing and other truck applications.
Direct fuel injection, which uses high-pressure fuel injectors to spray a fine mist of fuel directly into each cylinder. This precisely controlled fuel delivery improves the engine's transient response, contributes to improved fuel economy and enables improved emissions, particularly at cold start.
Turbocharging for increased boost and power; precise controls mean instant spool up.
20 percent better fuel economy and reduced CO2 emissions compared to a larger naturally aspirated engine.

It should be interesting to see it perform in real world applications compared to the V8's. Ford does a whole heck of a lot of testing on stuff, so I'm pretty confident it will be a good engine. I guess we have a while until we can say for sure. Supposed to be late 2010.