Gingerbread itself will be faster than Froyo. Whether the speed of the Nexus S GB will be faster than Nexus One GB is the question. test in the past have show faster Benchmark test of the Galaxy S being faster than N1, so in theory one could say the NS will be faster than N1. They may be both running on 1gHz processor, Hummingbird could process in a way that could be faster than A8. I don't know much about processing.

If you're talking about 3G Speeds on Network, I guess not. The phone does not support 4g service.