While they again did not outright confirm his appearance, the following quotes heavily suggest that will be the case.
Steel Serpent, also known as Davos, was born in the mystical world of K’un-Lun but after losing the powers of the Iron Fist to Rand sets out to get his revenge.
After this rather coy response from both actors, Yahoo pushed back and asked them directly if Steel Serpent was one of the characters they were alluding too.
Hey look, that’s going to be announced very soon so I wouldn’t be surprised if that’s announced before these [interviews] even come to print.