I recently e-mailed TE to ask if there has been any changes/upgrades (other than the scratch resistant display glass) to the OP-1 since the first production in 2011. I figured I’d share their response with you guys.
TE: “It is true that we have changed the display glass to a more scratch resistant plastic, but apart from that, no major changes has been made. We are currently working on updating the microphone, to make it more durable and less sensitive to dust and dirt, but we are not planning to change any I/O on the OP-1 as of now.”