The only case I've heard about of a company limiting TrueHD support to two-channel was the Toshiba HD-A1/XA1, and both of those received firmware updates quite some time ago (early fall?) to extend the TrueHD support to multichannel (although for analog output it would be 5.1 since both players only offered 5.1 analog outputs). I'd certainly hope that Panasonic would only support TrueHD with multichannel.