On a different topic from the previous posts toonzone said the episode after broadway baby will be called slap slap revolution

dont know maybe swiss alps since in commercials there semed to be a game similar to dance dance revolution

All of the locations of the 26 episodes are confirmed. If you look at Archive ten of Talk: Total Drama World Tour on the wiki, maps were leaked as to where the cast is going in every episode. I suggest that if you want to be surprised, don't look at them. They give big hints on who's going to make the merge.

I've heard things about Heather, Cody, and Alejandro being the final 3, but I actually think that Heather, Sierra, and Alejandro will be in the final 3.

were you the one who post it on the wiki page? and how do we know its definitly true

^No, I did not post it, but I am shocked about how they got the information.

My personal speculation on Blainley:

Either the clips of her are from the after the finale special, or if they have the Aftermath members do little challenges too, and she's interviewing them.

how did they get the information about the episodes?

My personal speculation on the winner:

In one trailer, we see some of the competitors of World Tour standing beside the non returners (Katie, Sadie, Trent, Justin, Beth). The ones we see in that shot are Owen, Duncan, Harold, Izzy, Cody, Courtney, Lindsay, and DJ. IMO it looks they're in Hawaii in one shot of the trailer, since we think that's the last episode of the season. Besides an Aftermath, I think the finale's the only other time we'll see the non-returners.

Besides the 8 listed above, we also know Bridgette, Ezekiel, and Leshawna are eliminated or will be.

This leads me to believe that the Final Two will be two of the following people, who are not in that shot and we're not lead to believe they've been eliminated yet:

Gwen

Heather

Sierra

Noah

Tyler

Alejandro.

The trailer I'm referring to is called the TDWT teletoon trailer on youtube. This is just personal speculation, and I could be wrong.