A tag team is a lot different than a swap out character. Revealing a duo like that seperately is counter-intuitive.
Sorry, I misunderstood what you meant by tag-team.
In wrestling terms, a tag-team means two fighters that switch out. One is in the battle, and one is standing on the side if the ring. When the fighter wants to switch out, he "tags" the waiting fighter, which swaps their positions.
Is really, a tag-team should be what Zelda & Shiek are called.
When two characters are always on the screen like Ice Climbers, I simply call them, "Ice Climber-like characters."
Sheik is not visible at all times when you are using Zelda, it would safe to assume that this is not the case for a Tag-Team as both members would need to be visible at all times for them to be a team.
Hence why Dixie and Diddy would have to be revealed together to be a team, it follows the same logic the Ice Climbers, Pokemon Trainer, Pikmin & Olimar, and Rosalina & Luma appear together. They're all teams. Zelda / Sheik and Samus / Zero Suit are not teams.
Above.
Speaking of Pokémon Trainer, I don't know how he will be on the website.
Since he is 3 full-fledged characters in one, I'd think that all three website pages get added to the website on the day of the reveal.