The connection could be at the 1.3 level, but the TV set does not support Deep Colour (a new facility with 1.3). This is mentioned in the UK Panasonic press release
Smooth gradation lends natural expression to images
5,120 Equivalent Steps of Gradation A full 5,120 equivalent steps of gradation smoothly expresses each image. Outstanding gradation performance accurately depicts even the tiniest shades of colour in a sunset. It also supports the Deep Colour ( HDMITM V.1.3 ) standard, which is capable of expressing natural colours, to maximize the beautiful images of high-quality image sources.