The Zumwalt DDG 1000, the most advanced ship in out times, have a displacement of around 12,000t, with a sustained speed of around 30kt. Zumwalt In Main. Image © U.S. Navy
DDG 1000 will have a ‘tumblehome’ hull form, i.e. a design in which hull slopes inward from above the waterline. This will significantly reduce the radar cross section since such a slope returns a much less defined radar image rather than a more hard-angled hull form.
DDG 1000 will have a crew of 142, including the aviation detachment. This represented major theoretical cost saving compared to crew levels of 330 on Spruance destroyers and 200 on Oliver Hazard Perry frigates.
Have a look at the inner part of the Zumwalt futuristic warship by Popsci.