I think there is an entire thread of discussion that has been missing. Apple will be making a new "30 pin" connector for iPhone and iPad. One wonders if it will also show up on portamacs as well.
This port will be used on pads for docking to a physical ecosystem of keyboard, display, TV, printer, whatever, some or all of which can also see BT4 or wifi. Multi-homing in a sense.
One trick they could do is to make power and display go through the same physical wire. This would be consistent with a power plug design change. An extra lead or 4.
There have been zero rumors I have read on this, but if one were to assume that a new pad connector would be both smaller and also "insanely great", it might have a few features.
TB/MDP, HDMI, power, USB3/2/1.
It will be interesting to see when/if/how that evolves.
As for which standard, when Apple came out with HDMI ports it was not clear if they even supported audio and which standard. They have other hardware that supports more recent standards, but the software doesn't support it, which may be a QC issue or as Apple has done in the past actually cripple a capability for product positioning purposes.
So, I don't know.
It would be very Apple-ly to have a single convergence plug.
Rocketman