Information is limited for now, but here are the highlights:
$25.00 statement credit
"We are helping customers find you by placing all American Express small merchants on an online map so they can shop small at your business."
The map feature sounds like it will eliminate confusion over what businesses qualify for the offer. I'm not sure if they've had that in the past or not.
This has been posted in hot deals in past years, so that's where I put it again.