How likely is it that we'll see the Smart Connector on the new MBP?
It may have been raised before but this could effectively be the successor to MagSafe, only a more versatile solution. It's magnetic, transfers power and data, and is seemingly more reliable given the simplicity of the physical interface.
Judging from the leaked image of the unibody, it may then also help to explain why the area between the back of the chassis and the first USB-C port (left side, bottom image) appears flush; the Smart Connector would presumably require a different milling process than the simple blanks of speaker holes and USB ports.
Also, it may tie-in to how future iOS devices are interfaced and waterproofed. Apple could effectively drop Lightning and use only Smart Connector for charging and syncing. My guess is that at present, they're including it only with the iPhone 7 Plus as incentive to upgrade.
The Smart Connector plug could potentially look very similar to the current MagSafe, and the cable therefore would be compatible with both Macs and iOS devices - provided the other end featured a USB-3/C plug. This would be a very typical move for Apple as it simplifies cable requirements.
Lastly, if the MBA is believed to be having a redesign and continuation, then Smart Connector would be an upgrade over MagSafe and in turn an additional feature over the rMB. However this may only work (or make sense) if the rMB is positioned in a lower-tier to the new MBA.
Sorry if this has been raised before, it just strikes me as logical strategy.
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Without wanting to sound rude, this has been asked many, many times already. It's almost a given that Apple will dedicate the upcoming event to iOS devices, and the October event to Mac - just as it has done in recent times.