Are there any soundtracks being produced in a 7.1 at the moment? Is this a Dolby format or a DTS format or something else? Is it only available on DVD?
There is no 7.1 format in home cinema. The best we have at the moment is 6.1 which comes in 3 types:
DD-EX - really only 5.1 but with a matrixed surround back channel
DTS-ES matrix - same as above
DTS-ES Discrete - this is the closest we have to a true 6.1 format.