Recent scans from the Japanese magazine Coro Coro have revealed a few new game details on the mysterious Pokemon: Diamond and Pokemon: Pearl. Among the translated information is the return of the day/night system, with four distinct periods (dawn, day, dusk, and night) that will affect Pokemon behavior and appearance. In addition, male and female characters will now look different in-game; one of the genders might be larger, be missing certain features, or have different skin patterns. The traditional Pokedex will also be upgraded to include more than twenty features, including time management, type charts, monitoring of Pokemon in the breeding center, and more.
The Pokemon games have no confirmed release date in North America, but it shouldn't be too long before the market drops ten gajillion dollars on this tried-and-true franchise.
[Thanks Nushio, you tip-crazy fiend you]
[Update 1: clarified unknown N. American release date]