There is not a doubt in my mind that Sheik will return in the same fashion. Play similarly, perhaps a bit nerfed, and be a down b transformation just like in Melee.
However, I think she will have this design:
If you don't remember Zelda wearing this stuff, go play TP gain, she is dressed like this when you first meet her in the Twilight realm.
There are several reasons I believe this is "TP Shiek"
1. Very similar style wise. Ninja-like, disguises. And while you can't see it in the picture, the robe has the Sheikah symbol on its back.
2. Zelda's down-b move has been confirmed to be called "
Twilight Change". In TP, Zelda is only seen wearing these robes while imprisoned in the "
Twilight Realm".
3. In the first trailers for TP, "Robed Zelda" was falsely set up as a seperate character. Some Mysterious robed figure with a connection to the Twilight realm. Well guess what, It was Zelda! Just as with Shiek and Tetra, this was a horrendously predictable "Disguise" used by Zelda. But this one only appears once in the entire game, wouldn't it be cool for it to re-appear in Brawl?
I'll miss the old Shiek look, and who knows, maybe it will return. But I'm almost positive that this is what we will see in Brawl.