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I highly doubt Ichigo's zanpaktou is a fire type. It's already been established that his zanpaktou is hollow--that's its abilities. Now that he's added his quincy-likeness to the zanpaktou, it'll possess those types of abilities. All that happened in the creation of the blades was that it was extremely hot; that doesn't necessarily mean it's a fire-type.
Making it a fire type wouldn't really change it's functionality in the least, really. Not unless he gets some new techniques that would give his flames the versatility of Yamamoto's, but then it would just be a direct copy. I don't think it's a fire-type anyway. Tbh I don't expect Ichigo's new Bankai to have any major ability anyway, in his old Bankai the speed boost was really just part of an overall power boost and I wouldn't be surprised if the same goes for his current Bankai. Even his new Shikai is the same as the old one, just split in two. The only thing I could see changing is that the Quincy part of it might make him able to manipulate his reishi attacks, maybe if a GT misses he can turn it back around like a boomerang, or maybe he can alter it's shape and fire it in the form of a beam or arrow or something, but besides that I don't reckon he'll get such a defined ability as say, Hypnosis or Shunsui's games. It'll probably just be faster and stronger. Also I think it might combine the two swords into one big one.
With the last chapter I feel like his new Zanpaktou was likely forged from the spirit of the Soul King itself, it's been heavily hinted that they are ancestral and capable of so much more than just "Bankai", look no further than Kenpatchi and Komamura. I think his power is coming from a combination of Hollow, Shinigami, Fullbring, Quincy with the literal mastering of them all, I think it's a black flame that consumes all.
Perhaps what we will see in the future is each of his bankai having an element of the powers ichigo has. In the past his bankai had the qualities of cero. I think we will see the same but to a greater extent. Since he already has two swords I think we will see the shinigami with the qualities of cero it had before. And the other one in turn will get the qualities of quincy rieatsu, perhaps specifically the holy arrow. In a way we could already make a case that the way his GT work for his small sword is remiscent of shooting an arrow. so his Bankai will be black and white in the future.