The most recent types of accessories are towers designed to help you keep all your xbox gear together. In particular they get your xbox up off the floor and keep your games organized.
The Xbox 1 is the newest Xbox as of January 2014.
The color of the Xbox does not affect whether it is the newest version of the xbox. So no you cannot say that the "black" 360 is the newest.
xbox 360 elite
the xbox elite is the newist 1
The newest Wii accessories revealed in 2013 include: The Charge Station U for The Wii U, and the The Pro Commander. The Charge Station U simply charges Wiimotes. The Pro Commander is a new controller with a different stick configuration; much like the Xbox 360's controller.
The Xbox, and Xbox360 can be purchased online. The newest release Xbox 1 is also available online,at retail web sites and Amazon. If there is an Xbox that you are interested in , it can be found online.
Some accessories for the Xbox 360 include extra joysticks, 3d glasses, a web camera that is motion sensored, shooting stylus for shooting games, and also various rackets and clubs.
Warranties are available for the Xbox system. For the later models the warranties last one year for the actual Xbox, and 90 days for accessories. The Xbox must be registered after purchase in order for the warranty to be effective.
Kinect
Yes there are game specific accessories available for the Xbox 360 unit such as a steering wheel for racing games and headsets for talking to other players.
Xbox, Xbox 360, and Xbox 360 Slim(the newest one)
Information on the Xbox remote is available online. One should visit the Xbox website and in the section for Xbox 360 choose "accessories". It is then possible to find out all the information about the remote device.