Following are the screenshot of the add new page screen. This screenshots are from Dotnetnuke 5.0.0 RC2. There are two new features that I found on create new page/tab screen.
Parent page selection dropdown now display Admin & Host pages as well. So now you can add new pages under Admin & Host tab. This was not possible before.
Following screen shows that now you can create new page from an existing page. Now you have option to select various modules on source page to copy.