Actually, arturbars is correct.The promo that CBS was teasing before and during the 3 week hiatus was a mix of different episodes to come.
Kind of a, look at what the rest of this season has to offer, type of thing.
It is unusual for Survivor to do such things but ... they've never taken a 3 week break before.
I'm positive they just wanted to make sure to catch peoples attention. In hopes of not losing them during the hiatus.
And from the sheer volume of comments about it, I dare say it worked.
As far as the "crocodile attack".
CBS merely showed shots of Michael running into the water.
It was us, the online survivor community, that made wrong assumptions about that. We have only ourselves to blame.