SYTYCD Housemate Preview

New ads are promoting a sneak preview at one housemate during this week's final performance show of So You Think You Can Dance.

I wonder if whatever this promo is was planned for Rove that night and was moved after Kyle's on-air sook about Rove.

Regardless, why are we being treated with this preview. It is one of 3 things:

1. A genuine preview of a housemate, possibly obscured from full view in some way, just because they're being nice? (I DON'T THINK SO!)
2. Someone who will be part of a twist, e.g. a mole (but isn't that too obvious?)
3. A publicity stunt. The "housemate" will be someone or something other than the obvious.

If they were really going to say "hey, here's a housemate", wouldn't it make sense to make it one of the 3 the viewers voted in, and if it was a viewer's choice, wouldn't it make more sense to introduce all 3 on the show? Or maybe they will introduce the 3 viewer's choice HMs on different Channel 10 shows throughout the week.