It is not entirely clear as to what the wifi capability means with respect to home cinema systems. Let me explain the 2 possibilities.
Wifi can be used to link to PC’s and Laptops to view films or music stored on these devices but it can also be a method by which the rear 2 speakers on a 5.1 system can be fed signal as one of the main complaints of the 5.1 systems is the amount of wiring feeding the speakers.  Manufacturers don’t seem to be very helpful in being clear on this point before purchase.