XDA showed today some new shots of Nexus S, also sharing some technical specifications, you can see them all here:
The device itself looks not bad, but I would prefer it to be made more than Samsung Wave (plastic + metal), or previous Nexus, than Galaxy S line. Hope the overall feeling will be acceptable.
The specs are nothing shocking too, I guess the XDA source meant 328 MB of RAM free, so overall would be 512 MB. Thats enough, but many expeted it would be 728 MB.
The refreshed statusbar, also looks not bad, but thats nothing extraordinary.
I guess we will see many other leaks in following days, and I feel that the device launch day will be soon announced.