From the article "Common to both MHL and MyDP is the need for an additional transmitter (driver) chip as well as a switcher chip that goes back and forth betwee

From the article "Common to both MHL and MyDP is the need for an additional transmitter (driver) chip as well as a switcher chip that goes back and forth between that and the USB transceivers. This, of course, implies additional space on the device board for these chips, traces and passive components, as well as increased power consumption. You can, of course, put in a micro-HDMI connector and drive that directly, that would save neither space nor power." That's not microUSB becoming compatible - It's having to add hardware inside the device which makes use of microUSB's pins. The Lightning connector seems to push that to outside of the device i.e. make the right cable/adapter and software and you can adapt to anything without requiring support from specific hardware inside the device. At least that is what he seems to saying and it'll probably take some more analysis and dissection (not to mention actual adapters) to support that assertion.