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HDMI 1.4 will support 3 types of cables:

1. Current HDMI cables (1.0-1.3) for standard video/audio.  These can go from/to a 1.4 device to/from 1.0/1.3 device.

2. New HDMI cables for 1.4 (that include the up/down ethernet connectivity) Will also be necessary to transfer data >10.4 gb/s (the new 40k resolution).

3. A mini cable (like a mini USB port) for vehicles.

Old HDMI outputs (1.0/1.3) will most likely NOT be firmware upgradeable (1.4 is using a new chip, but 1.3b might be compatible.  No word on this yet)

Just to clarify what I said earlier :)