Another batch of preview crates have been datamined for the next season, as well as a handful of pets that fit the theme of the apex mounts of next crate season. If the current season is anything to go by, the "preview" crate will be a login reward as well, with a chance to get 1 of the 5-6 pet types, and essentially being locked out of getting any of the other pets, since you cannot buy them outright, and you only get 1 of them.
ZOS, this is a bad idea, a bad implementation. Reward a random pet if you like (it would be better to get a choice of your own. What's your obsession with random rewards and gambling mechanics that no one likes), but at least retain the possibility to buy one or several of the other pets if you like them. No one likes being locked out of getting stuff, due to some random roll of a die, and it's concerning an worrying that datamines reveal yet more of these "preview" crates. There's already plenty of threads on the forum complaining that we can't buy the Baandari pets, if you continue this trend, you'll only see more threads of the same nature in the next season.