At least leaked photos published today by Cult of Mac indicate as much. Four USB-C ports and one headphone jack are the only things anybody can see on the sides of the chassis.
The other thing missing from the chassis is the row of F1-F12 keys. In its place is a flat section — which could presumably be taken up by the "OLED display touch bar" that analyst Ming-Chi Kuo is expecting on the refreshed MacBook Pro.
But the switch from USB-A to USB-C is remarkable and will be jarring for those who haven't begun the journey with the MacBook or mobile devices that use the USB-C spec. This will solve the problem of not being able to simultaneously charge the laptop and charge a phone using the laptop, but this will also mean people will need more dongles in order to use peripherals such as external monitors and SD card readers.
Then again, it should be welcome to those who believe in industry standards. If the leaked photos are legitimate, it means Apple will be dispensing with its proprietary MagSafe charging mechanism. Also, unlike USB-A, USB-C is reversible, so users don’t have to flip it if they find out the hard way that they stuck it in wrong.