It's a coffee shop chain akin to Starbucks, although nowhere near as big. I think it might be only in Texas and a few other southern states.Wow! Earliest sighting yet! (No clue what Sertinos is...heading for Google..)
BTW, I did ask them if they could make me one of the pumpkin beverages, and I got a very curt "No" in response. When I politely pointed out that their marketing told me to ask for one, the underpaid staffer behind the counter said, "We don't have it yet. Check back in a couple weeks."