At this point, it's all marketing.
Caveat 1: There are no sources of deep color (yes, devices with HDMI 1.3 may support the data path, but there is no content encoded with deep color--most likely the extra bits will simply be zeroes, or interpolated).
Caveat 2: There are no displays which can resolve 48-bit color (yes, they will receive the data, but they can't produce such minute variations in color--especially LCD's which require a certain minimum voltage quanta to change at all).
Some newer displays can respond to more than 24-bit color (e.g. 30-bit color), but refer to caveat 1.
Unless you want to spend extra money for what will likely be, at best, a reduction in color banding via interpolation, I wouldn't worry too much about it until displays can routinely resolve at least 30-bit color.
Just be forewarned that for a while there will be many displays and players that have HDMI 1.3 and claim Deep Color capability, but will produce no discernible difference on the screen.
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