GM has announced that the platform-mates that are the Chevy Colorado, GMC Canyon, and Hummer H3 (and very likely the Isuzu pickup, though no mention has been made so far) will get larger versions of the I-4 and I-5 engines they currently use (only I-5 on the Hummer).
These engines promise better performance and improved emissions.
The 2.8l I-4 is being replaced with a 2.9l I-4 with 6% more power and 3% more torque.
The 3.5l I-5 is being replaced by a 3.7l I-5 with 22 more horsepower and 17 lb*ft more torque.
Both engines promise to also be quieter while the I-5 also promises better emissions performance.