The surprise promised in the episode 4 preview is almost certainly the elimination of Rob and Amber. Nothing else would be suitably monumental and it does fit the boot list perfectly. Episode 4 is highly probable to be elimination based on everything we know. The interesting question that remains open is how the teams get from Punta Arenas to Tierra del Fuego National Park near Ushuaia. there a re few options and they have been reviews previously in the SPOILER thread. Summarizing, no scheduled flights exist on Sunday 11/26, by water is too slow, and that leaves ferry to Porvenir and then either bus or U-drove car from there to the park, an 8 to 9 hour drive. Charter flight is also a possibility, as indicated by GEORGIA PEACH below before I added this sentence.