Installed the dev preview today, and found that Cortana has taken over the search button. Okay.
The problem is that I don't see the option to do a vision search anymore. I'm unsure of the exact terms, but this answer has a screenshot of the button
With the vision search you could snap pics of QR codes, or OCR text for copying it or translation.
Now I can't figure out how to do this with Cortana! The only way to access this functionality is to hit the camera button and change lenses.
Am I missing something? Is this in the pipes for 8.1 once it is out of beta?