By watching the video one can see that RedD00r featured an easy to use installation wizard, and does indeed bring the iOS 5 look and feel to the iOS 4 firmware generation.

Quote Originally Posted by IJAILBREAK
Although not all the features of iOS 5 are brought over with the RedD00r and WhiteD00r custom firmwares it is still the only way to enjoy some of the extra functionality Apple excluded older generation iOS devices from having. The features that these custom firmwares do bring to the table however, include custom backgrounds (wallpapers), the semi transparent dock, new system sounds, new icons from iOS 5, multitasking, tap-to-focus camera, a special version of iCloud that uses DropBox and much more.