I accidentally found this as well
Getsuga Tenshō (月牙天衝, Moon Fang Striking The Sky): Zangetsu's special attack remains Getsuga Tenshō and can be used in the same manners, but can be used in an enhanced form. In Bankai, Getsuga Tenshō has several distinguishing features and abilities separating it from its shikai counterpart.
Shibari no Kage (縛りの影, Binding Shadow): By utilizing the ability to condense spiritual energy into many shapes and forms, Saigetsu will channel a small amount of spiritual energy into the tip of the blade and release it into the form of a massive tangible chain-like pattern. With better concentration this chain-like pattern can be subsequently solidified and manipulated in order to bind and restrict an opponent’s movements.
Getsuga" (黒月牙, "Black Moon Fang"), due to the attack's darkened color. Zangetsu can also keep Getsuga Tenshō within the blade to augment his sword swings. The technique is also very malleable, as its shape will change depending on the manner in which it is used.
Kyūkyoku no Getsuga Tenshō (究極の月牙天冲, The Ultimate Moon Fang Striking The Sky): When using this technique, it causes the physical manifestation of Zangetsu’s bankai to disappear and is replaced by a blade made up of pure spiritual energy. The spectral or ethereal blade is apparently made up of the same energy which makes up the getsuga tensho, its appearance is that of a long black blade wrapping itself around zangetsu’s left arm. In this form Zangetsu is able to use the powers of the Getsuga Tensho as he would in bankai but is now able to manipulate getsuga much freely as it is no longer restricted to a physical body. The ethereal blade emits black spiritual energy most of which is focused around his left arm. Zangetsu can fire blasts of black spiritual energy and when fully charged it is capable of doing more damage by causing a wide spread blast of black spiritual energy.
Getsuga Enkou (月牙炎光, Flaming Moon Fang) - coming soon
Shōgetsu (食月, Eclipsing Moon): Coming Soon.......
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