You can get a few wireless all-in-one home cinema systems where the main unit houses the player as well as decoder, processor and amplifier. You can also make any speakers "wireless" but adding a wireless module, There are a few around for example Kef. Sony have the S-Air system too. To be honest, you are better off looking at how to run cables in the room as a cabled setup will sound better and you won't have any potential interference issues from other wireless devices in the home e.g. wifi, dect phones and so on.
Have a look at d-line conduit for example and flat cable such as ixos 233.