My older sister and I were big Tic Tac eaters when we were younger. We both liked the orange ones best, even though it was common knowledge that they actually made breath worse.
I first heard about these from a candy blog, but when I searched the Internet, I couldn't find it, so I can't remember which it was. Anyhow, they were released a while ago, but it takes some things a while to get to my town.
They look like standard Tic Tacs, despite coming in a bigger box. At first, the taste is very similar to orange, but once a little of the coating is gone, the grapefruit notes really kick in. It's sour, a little bitter, and fairly authentic ("dry pink grapefruit juice" is listed in the ingredients). There's also a mintiness in the background, but I wouldn't choose these as a breath freshener.
The taste was very similar to grapefruit Jelly Belly jelly beans, or grapefruit e-ma, which also has a minty kick. The mintiness did remind me of a throat lozenge, but I still enjoyed these. They went over well at work, too.
Tic Tac website