Does anyone have an idea of which wanderers will be featured in the boxed set?

The six oldest ones.

Khaine, Derec, Faust, Akio , Tsubasa, Sophia.

No one knows about LE Khaine but its probably a way to get rid of all normal Khaine models so that they can field a full fledge blister of LE Khaine.

Just a speculation though.

thanks, just wanted a rough idea on which models were in it so i could tell my friend.