will Ultraforge cannibalize FF?

No, it won't -- at lest, not in its first decade.

UF and FF are different products, with different approaches and skillsets that don't always overlap. For the foreseeable future, Filter Forge will still remain a great tool for creating seamlessly-tiled procedural textures, while Ultraforge will be a more general image generation and processing tool offering, among other things, nodes for generative AI.

Plus, don't forget the Filter Library -- Filter Forge has 14k filters submitted by users, and Ultraforge, while being a more powerful tool in general, won't have that at release.

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Ray Mew wrote: So by saying that we won't be able to jointly use the FF library for UF at the moment.

Yes, that is correct. The differences between FF and UF are significant enough to make them incompatible. Of course we explored the idea of automatic conversion of FF filters into UF documents, but found the idea to be impractical.