It looks like the touchpad might have a lip that slips into that smaller hole on the left side of the cutout, keeping it in place. The hole on the right side appears to contain three pins, which likely connects the touchpad to the logic board.
According to the photos, the MacBook Pro appears to have two USB-C ports on the left and two on the right. There also appears to be a headphone jack.
The images corroborate a report from KGI Securities analyst Ming-Chi Kuo last week. Kuo said Apple is working on a major update to the MacBook Pro which will bring a new OLED display touch bar above the keyboard, USB-C/Thunderbolt 3, and Touch ID.
We'd definitely like to see the new notebook unveiled at WWDC but unfortunately the release date is currently being pegged at sometime in 4Q16.
Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.