Yes, after it could be used as data source, after a few release cycles it highly likely could be used as an alternative back-end

And what about kotlin dataframes? I saw that it now does not depend on krangl.

We suppose, it could be used as data source too, but need to wait public release to move forward, also Kotlin DL manipulation with data sources is in early alpha

I better don't ask, What is Kotlin DataFrames? I can image its kotlin-pandas by JB, but I didn't find repo for this. Generally I am not sure how far DF are useful other then for data preparation, which can be seen as separate step from DL/ML stuff ... Just ignore my newbie lack of knowledge, if necessary I am just curious and learning DS