User blog comment:Xilinoc/Ch. 556 - The Wolfsbane/@comment-24099400-20131106210346/@comment-11051098-20131106223115

Now that you mentioned it - Hitsugaya was the one who appeared to get hollow effects to his appearance, like the ice covering his ears and upper left quarter of his face, giving him the dark "hollow eye". And Sui-Fêng and Sajin's Bankais didn't appear to change either, except Sajin's Bankai's armor falling apart.

I hope Shinji gets healed by Momo and eventually release his Bankai against a Sternritter. If I remember correct, Kubo said he would show all Bankais in this arc.