On the Bedrock this is currently a holiday daily giveaway. Items on the daily giveaway aren't viewable, until the day they are available for free. That was the case, until now.

On the Nintendo Switch version, since last night, one of the items is viewable before it is officially free. Item can't be redeemed yet though.

It is not viewable on my android yet, though. It may be a bug exclusive to the Nintendo Switch Version. I own both the android and Nintendo Switch versions of Minecraft, so I can tell you.