Renji Abarai, Byakuya Kuchiki, Toshiro Hitsugaya, Zaraki Kenpachi and Ikkaku Madarame have all got a brand new look. If you think that it looks somewhat the same, your correct but there have been some small little changes which make large differences throughout the whole Anime.
As seen here, in Bleach New Look Overview blog post. Some of these changes include:
Renji’s New Look: Renji has now got a black headband instead of a white one which he usually has. Also, his hair style may have changed a little from his last form as now he uses his headband to hold the back of his hair. Furthermore, Renji’s hair has grown longer, plus he has long dark straps on each wrist with bandages over his arms.
Byakuya’s New Look: Byakuya wears his kenseikan at the back of his head, he also wear a variation of captain haori with a high collar which has a light gold on its edges and small, light gold tassels attacked to the corner. Furthermore, Byakuya no longer wear his scarf, due to the collars.
Hitsugaya’s New Look: A year and a half after Aizen’s defeat, shortly after Ichigo regains his Shinigami powers when Rukia stabbed him with the white sword, Toshiro appears sporting a hairstyle similar to that before he became a Shinigami, and a long turquoise scarf. His green sash is also changed to a thin chain, but it still retains the star-like clip. Furthermore his hair has grown longer, while he’s stayed the same height.
Zaraki’s New Look: When he arrives, after Ichigo was stabbed by Rukia, we see Zaraki’s New Look. When the Shinigami’s are separated we finally see that Zaraki’s look hasn’t changed much. All his cloths are still the same. Except for his eye patch which he covers his right with. His old eye patch had straps which connect at the back of his head, however in this new look, Zaraki’s new patch seems to be just a strap on which he puts in. His scar still exists on his left eye. Furthermore, before, the tips of his hair had bells on. Now his hair doesn’t seem to have any bells.
Madarame’s New Look: He has gained a gold-colored shoulder armor with a Kanji for ‘dragon’ on it. Madara has also gotten a lot more spirit as well as fair during fights as he makes sure that Moe, his opponent, is able to know what he’s getting into when he got into a fight with Ikkaku. Plus he seems a lot more chilled out as well as cool.