I just noticed the new Uncle Tetsu location has opened inside York Concourse when I was on my way to GO customer service. It is on your right side if you are facing the customer service counter, and on the opposite end of Booster Juice.
According to their website, their store hours are from:
Monday - Friday 8am - 9pm
Saturday and Sunday 10am - 8pm
Luckily, there was no line up so I was able to buy a cheesecake within 2 seconds. They had samples so I tried one (it was cold) with a toothpick. There were two toothpick boxes, so i was looking to see where to dispose my toothpick. Unless I read it wrong, but both boxes said "clean" on it.
Cash only -- I usually don't carry cash, but this time I had or else I wouldn't be able to buy one.