We always try and predict the future, but every time we find a connector (and finding the connector for the MkII took a specialist in the field about 3 months...) we use all the pins :)
The MkII has a 24-way connector (MkI was 16). 5 of these are for the external tuner - which we hope to offer a DAB option for - and the others are microphone, accessory/lights on sense and mobile phone mute (which can be used as CTS on the dockable serial, allowing things like Ricochet with brain-damaged flow control to work correctly).
We do hope to stay with the same connector. We've had to buy thousands of them to make the price even vaguely reasonable. Everything but the audio now goes to an ISO connector, which means fitting should be quite a bit easier.
Hugo