On topic, I noticed the Red or Blue Yoshis haven't been seen since the box art surfaced. I wonder if they replaced them with the Pink and Light Blue Yoshis?
That would horribly screw up the sense of the game, but if you think about it, COULD make sense. First of all, Pink and Light Blue (and some more) colored Yoshis were the only ones found on Isle Delfino, which is NOT in the Mushroom Kingdom, however, it can be debated if Dinosaur Island, where Yoshi first debuted (SMW for those who don't know), was really in the Mushroom Kingdom either. If not, then this would make sense...plus, to further confuse us, notice how the only instance of a Yoshi in the Mushroom Kingdom, in SM64 was a single Yoshi. Rather,
the Yoshi. Notice how there is supposedly a single Yoshi in SMW too, but Mario sometimes uses his friends. That/those Yoshis have some sense of intelligence and can talk. Same with Yoshi in SM64. However, the Isle Delfino Yoshis are unable to talk, and never do. So basically, it sort of makes sense to use Pink and Light Blue Yoshis, but that'll screw everything up if they have some sort of intelligence.