Alright people, I just bought a bottle.
This tastes interesting. It's close to Diet Coke. The tea flavor is there, but I kinda had to look for it on my first sip. After the first sip, though, you recognize it more clearly. Yes, it even gives you a light green tea aftertaste. Older people who were reluctant to drink Coke might find it easier to drink.
I think Coca Cola is serious about this new product. It's nothing like the Pepsi Ice Cucumber from a couple of years ago, which was totally a marketing/advertisement gimmick by Pepsi Japan.