This is what I was just thinking. The confirmation and evidences are too abrupt and suspicious. It's like a staged relationship.

Suspicion #1: I'm sure Taeyeon knows how many sasaeng fans usually stalks idols even in their dorms. Why would she pick Baekhyun up in her known 'Porsche' who's as famous as she is. Comparable to GD's White Bentley and Lamborghini.
Suspicion #2: If they decided to have a car date and be discreet about it, why is the top of the convertible down and also the windows? It's like they got caught on purpose.
Suspicion #3: A number of SM staff are outside one of their dorms. Isn't it just too obvious?
Suspicion #4: The photos were taken days before EXO's first concert, but no other photos from the past were dug up. 
Suspicion #5: This got confirmed a week after Kris' first trial in court about his lawsuit.

Suspicion #6: During Yoona, Sooyoung and Tiffany's confirmation, the papzz only got their pictures when they were going back to the car. While Taeyeon got photographed the whole 'date' and with different angles too.

And these are the reasons why I will accept and support but not believe. If they are doing this as a huge media play for money and assurance on SM's part, this isn't not fair for Taeyeon, Baekhyun, EXOstans and SONEs.