Well, some of the things the Northstar has, and other GM technologies that will likely show up on the Northstar in the future would most likely have shown up on a modern LT5:
- coil-on-plug ignition
- composite intake manifold
- variable valve timing (might be very different on the N* than today if they'd gone ahead with the Lotus style they were experimenting with instead of the cam phasing type on the current N*)
- direct injection
- supercharged and intercooled possibly
- 6-speed auto option
I suspect things like active suspension wouldn't happen in favor of Magnetic Ride Control. Body and weight improvments would likely be like the C6 Z06.